Replacement activated-carbon pads for hooded litter boxes and automatic toilets: 12 per pack, 15 × 20 cm, trim to fit with scissors.
A hooded litter box keeps the smell inside, but the air still leaves it — through the vent in the lid. The carbon pad goes exactly there: air passes through a porous layer of activated carbon, and part of the odour compounds stays in the pad instead of spreading around the room.
Each pack contains 12 pads, 15 × 20 cm. The material is soft non-woven polyester impregnated with activated carbon, so a pad is easy to trim with ordinary scissors to fit a non-standard cartridge. Replacing takes a few seconds and needs no tools: pull the old pad out, lay the new one into the recess in the lid and tuck its edges under the retaining tabs.
The pad is unscented: it does not cover odour with fragrance, it absorbs it. The carbon is used up gradually, so a pad is usually changed every 3–4 weeks — one pack lasts almost a year for a single litter box. The filter does not replace cleaning the box; it works in between.
| Type | Replacement carbon pad |
| Pet | Cat |
| Material | Non-woven polyester with activated carbon |
| Colour | Black |
| Pad size | 15 × 20 cm |
| Quantity per pack | 12 pcs |
| Compatibility | Hooded litter boxes and automatic toilets with a filter cartridge |
Characteristics and features are given according to the manufacturer. This product is intended for everyday use with pets and is not a veterinary or medical product. If your pet has a medical condition, consult your veterinarian.
Fitted a compatible litter box from another brand perfectly, no need to trim them with scissors.
Hello. Thank you for your comment. We are glad the dimensions fit your model.
Our place is a studio, so the hooded litter box basically lives a few steps from the kitchen counter — not exactly ideal when odors build up fast. Once I slid these Fernpaw carbon pads into the cartridge, though, the difference showed up almost right away, like within a day. The ammonia smell is just gone and the air stays clean. We're on a regular swap schedule since the box gets used daily, and a pack of 12 means we're covered for months. The polyester held together fine when I pulled an old one out to replace it too. Happy with these, will reorder when we run low.
Hello. Thank you for your detailed comment. In studio apartments, litter box hygiene is indeed critical.
Easy to use replacement filter. Keeps the litter box area smelling fresher, super.
The 3 cm thickness fit perfectly. I was skeptical, but the smell is really gone.
Good afternoon. Thank you for your review. Carbon absorbers have proven themselves well in such tasks.
Worth every cent, honestly. I used to pay a lot more for filters at the vet's office, and these do just as good a job. Dense carbon core, sturdy polyester shell around it — nothing feels cheap. It dropped right into our old cartridge-style box without any trimming, sized close to 20 by 15 cm. Bathroom smells fine now even on days I put off cleaning. Definitely buying this pack again, should last close to a year.
Hello. Thank you for your detailed review. We are glad that the price-to-quality ratio met your expectations.
Musya, our British Shorthair, and Barsik, just a regular house cat, share one litter box that sits in a closet right next to the kitchen — so any smell used to travel fast. I fitted these pads into the hood and noticed the carbon start working almost immediately. It's held up well too; durable enough that the cats haven't managed to claw through it. I've swapped it twice in about six weeks now, and the closet is actually pleasant to walk into these days. Not a medical product obviously, just a solid hygiene fix, but it does that job very well.
I appreciated the modern design, but the package says 12 pieces, though they seemed to weigh very little.
Fernpaw filters are very practical. Deodorization works flawlessly between scheduled cleanings.
Hello. Thank you for your high rating. We are glad to make caring for your pet easier.
The carbon filters are perfect, there were exactly 12 pieces in the pack, all in perfect condition.
Hello. Thank you for your comment. We strictly monitor the product packaging at our warehouse.
Keeps the litter box area smelling fresh. Replaced it after a month, everything was dry.
I use it for a litter box enclosure. The air has become noticeably cleaner, no air fresheners needed.
Slid right into the cartridge with no trimming needed — the panel is roughly 20 x 15 cm. Fernpaw's filters just work with our litter box, no fuss at all.
Hello. Thank you for your comment. Standard dimensions really make choosing accessories easier.
Would buy again without hesitation. The specifications fully match those stated on the website.
Small apartment here, and our litter box sits in a closet right beside the kitchen, so this used to be a real problem before we found these pads. The activated carbon inside the polyester soaks up odor almost like a sponge. I swap the cartridge roughly every three weeks. Fernpaw claims strong deodorizing and for once the marketing matches reality. Happy with it overall, and the 2-piece pack is a convenient amount to have on hand.
Good afternoon. Thank you for your detailed review. In small spaces, good ventilation and filtration are especially important.
They eliminate odors perfectly, the activated carbon works. But when cutting with scissors, the polyester edges fray quite a bit.
Hello. Thank you for your review. For a clean cut, we recommend using a utility knife or micro-serrated scissors.
Weighs next to nothing, 50 grams, but it does its job; the carbon absorbs odors perfectly.
Hello. Thank you for your purchase. The light weight is due to the porosity of the activated carbon.
The polyester material feels nice to the touch and is dense. The carbon doesn't spill out.
Our cat is older and has kidney issues, which meant the litter box smell had gotten genuinely unbearable — none of the usual deodorizing sprays made a dent. Figured we'd give these Fernpaw carbon filters a shot, and honestly the result surprised me. That particular sharp odor is basically neutralized now. We're changing it weekly given how demanding our situation is, and it keeps up. Fully satisfied — this feels built for exactly this kind of tough, everyday case.
The polyester material is durable. The activated filler eliminates odors well. Recommend.
Good afternoon. Thank you for the recommendation. The polyester reliably holds the carbon granules.
Keeps the litter box area smelling fresh, just as claimed by the manufacturer. Five stars.
Good afternoon. Thank you for your purchase and high rating of the product.
Would buy again. Keeps the litter box area smelling fresh between cleanings, perfect for a cat.
I was looking for filters compatible with a litter box enclosure, and these fit perfectly. They are easy to insert into the cartridge, require no fasteners, and everything is intuitive. At first, the cat sniffed the new thing on the lid, but then got used to it and doesn't pay any attention to it. The activated carbon literally absorbs all odors during the first few weeks; the apartment is now fresh, even when we don't clean the box every day. The manufacturer Fernpaw states it's for everyday use, and that's exactly how it works in practice. A pack of 12 lasts exactly a year, a very convenient format.
Hello. Thank you for the detailed story of your experience. We are glad your pet quickly adapted to the new accessory.
Barely weighs anything, about 50 grams. No wasted material, just a compact, functional pad sized to fit standard cartridges nicely.
Hello. Thank you for your review. The compact size makes it easy to store spare filters.
Took me a while to find something that actually worked for our hooded litter box. Basya, my cat, lives with me in a studio, so there's nowhere for a bad smell to hide. These Fernpaw pads genuinely soak up the odor between cleanings. A pack of 12 should keep us going for around half a year at our usage rate. They do what they're supposed to, so I'll be picking up more.
The black color doesn't ruin the look inside the litter box. It contains odors well, I'm completely satisfied.
Hello. Thank you for your purchase. We are glad that the functionality and appearance of the pads met your expectations.
The freshness is noticeable right away. But I have to change it every ten days, not every twenty as stated.
Got these for Mia, my Siamese. Her litter box lives in a small pantry, and smells used to build up in there fast. These charcoal inserts turned that around completely — we're on a two-week replacement cycle and the room stays fresh the whole time. Solid product from Fernpaw, and I'll be ordering a couple more packs once this one runs out.
Hello. Thank you for the detailed review. We’re glad Fernpaw products helped solve the odor problem in a small space.
These charcoal inserts are just great. They keep the litter area fresh, and the smell doesn’t spread.
The activated charcoal included really reduces odors. There are 12 pieces in the package, so it turned out to be a very good deal.
The polyester is strong and doesn’t tear when replacing it. I’ll keep buying these filters.
Hello. Thank you for your review. The strength of the material really is important when replacing the cassette.
The package has two packs of 6, 12 total as stated. Original product.
Hello. Thank you for checking the contents and for your review.
They fit our automatic litter box with no issues. Everything works as it should, no smell.
Hello. Thank you for your review. The charcoal inserts are compatible with many models, including automatic ones.
Easy to use. The activated charcoal removes the smell from the litter box instantly.
Good afternoon. Thank you for your comment. We’re glad you were pleased with the result.
12 pieces in a pack is a good deal, Fernpaw made a good product. They filter very well.
Hello. We appreciate your rating. We hope the next packs won’t disappoint you either.
Would order these again without thinking twice. Light at roughly 50 grams, and the panel slots into the cassette just right at about 20 by 15 cm and 3 cm thick.
Good afternoon. Thank you for your review. The insert dimensions are universal for many litter box models.
I bought them for everyday use. The litter box smell is completely gone, and the cat is happy.
Keeps the litter area smelling fresh perfectly. I recommend these inserts to everyone.
The black and white colors of the filter don’t look as dirty, and the charcoal inside completely absorbs the smell.
Hello. We appreciate your comment. The contrasting color really does help visually assess the condition.
The charcoal is truly active, not just a fragrance. The litter area constantly smells fresh.
Hello. Thank you for your feedback. The sorption properties of charcoal are the basis of how the filter works.
I would buy them again, the activated charcoal neutralizes odors from the cat litter box very well.
Good afternoon. Thank you for your trust in the Fernpaw brand. We’ll be happy to have you among our regular customers.
They tone down the smell, but don’t remove it completely. I expected more from activated charcoal.
Good afternoon. Activated charcoal effectively absorbs odors, but its performance may decrease in high temperatures or humidity. We recommend replacing the inserts more often.
They weigh only 50 grams, light and compact. The deodorizing works brilliantly in our bathroom.
The deodorizing works perfectly. It’s very convenient that there are 12 pieces in one delivery.
Good afternoon. Thank you for your review. The large package size is designed for long-term use.
Fernpaw makes good products. The black side with charcoal works great. I would buy again.
Hello. Thank you for your review. We’re glad the functionality of the inserts worked for you.
They handle deodorizing well. It’s now much easier and fresher to breathe in the bathroom.
Guests coming over used to be stressful because our litter box sits in the hallway right by the front door, and the smell was hard to hide. Grabbed a 12-pack of these Fernpaw filters to try, and installation was simple — the panel is sized to match the lid slots closely, somewhere around 20 by 15 cm. By the second day I could already tell a difference. The charcoal granules keep soaking up odor between cleanings, so the hallway just smells normal now. Looks decent too, feels well made and sturdy. Very pleased with how this turned out, will buy again, and I'd recommend it to anyone with a covered box.
The charcoal really works, the smell in the apartment is completely gone. The Fernpaw brand can be trusted.
Ours needed something close to 20 by 15 cm and this hit the mark exactly — swapping the insert out is actually easy now instead of a hassle.
The filter cassette has been a lifesaver. I’m completely satisfied, the product really helps.
The product was a perfect fit for my cat. Easy to put into the litter box house.
Designed for daily use, we always keep them on hand. Completely satisfied with the quality.
Good day. Thank you for choosing our brand.
Modern style and looks neat. Popped it into the cartridge and forgot about unpleasant surprises.
Good day. Thank you for your purchase and high rating.
Wasn't sure these were even necessary for a covered litter box, but I picked up a pack to test it out. Turns out the activated carbon works really well — our pet's litter box is in what's basically his own room, and there's no bad smell between cleanings anymore. Looks modern too, and the polyester base feels sturdy. Worth the money, no complaints.
Dropped straight into our covered litter box with zero adjustment — the panel's dimensions matched the slot down to the millimeter.
Hello. Thank you for your purchase. We are glad the dimensions of the inserts fit your litter box.
This is my second order of these carbon filters. With two cats sharing one enclosed litter box, it gets used constantly, but the carbon does its job — the smell clears out almost right after they use the box. Design is modern without getting in the way of function, looks neat too. Good value overall, so I'll keep ordering.
The polyester material is dense and doesn't tear when replacing. There are 12 pieces in the pack, enough for almost a year.
Fit compatible litter box models with no problems. Plugged it in and forgot about it.
Spent a while hunting for the right replacement cartridges for our automatic litter box before settling on Fernpaw's version. Size-wise it's a close match to the slot, somewhere around 20 x 15 x 3 cm, and the activated carbon noticeably cuts down odor between the scheduled cleaning cycles. Our cat's just a regular indoor cat but uses the box a lot, and the room still doesn't smell. Replacing it monthly, and I'll keep buying this brand.
Replacing filters is no longer a problem. Easy to use even blindly by feel in the dark.
Good day. Thank you for your rating. The ease of installation really saves time.
The inserts are easy to use and install. Even a child could handle it. Smells in the hallway don't linger anymore.
Good day. Thank you for your rating. We tried to make the replacement process as simple as possible.
The pack weighs 50 grams, very light. I thought there was nothing inside.
Good day. The net weight of the product is stated correctly and is due to the use of a lightweight polyester mesh base containing the carbon absorbent inside.
The inserts work, there is almost no smell from the litter box. Only the Fernpaw brand marking is barely visible on the envelope.
Good day. Thank you for your review. We are updating the packaging design and will take your note about the logo visibility into account.
The inserts fit easily into the cartridge. The activated carbon does the job.
Ordered for an enclosure with a cartridge. Easy to use and install, they hold firmly. Five stars.
Good day. Thank you for the high rating. The shape of the inserts is designed for maximum ease of installation.
These carbon inserts saved my nerves. The bathroom smells normal now.
Good day. Thank you for your review. We are glad the odor issue was resolved.
The black and white color perfectly hides litter dust. A small thing, but nice.
Hello. Thank you for your comment. The two-tone design really is practical for everyday use.
Would buy again, as this isn't a veterinary product, but simply a hygiene accessory that works.
Hello. Thank you for your rating. You are absolutely right, it is an effective product for everyday hygiene.
The litter box filters do an excellent job, the smell no longer escapes the enclosure.
Hello. We appreciate your review. We hope the product continues to delight you with its quality.
Easy to change the inserts. Maintains freshness in the toilet area at a 5-star level.
Fit a similar litter box model just fine at around 20 x 15 cm, and the carbon inside does a genuinely good job.
Easy to use, no need to cut or trim anything to fit the cartridge.
Hello. Thank you for your purchase. The ready-to-install format saves you time.
Bought for an automatic litter box, they fit perfectly without trimming. The activated carbon works excellently.
Good day. Thank you for your feedback. The carbon inserts are designed for use in automatic models.
White and black color, modern style. Bought a pack, will last a long time. Deodorization is top notch.
These carbon filters saved our bathroom. Easy to change, the deodorizing effect is noticeable immediately.
Would buy again, the inserts maintain freshness in the toilet area. Very convenient to replace.
Keeps the litter box area smelling fresh, especially in small spaces. I recommend it.
Modern, stylish packaging design, but most importantly, the activated charcoal works flawlessly.
Hello. Thank you for your comment. We pay attention both to the packaging and to the quality of the filter itself.
The cartridge doesn't stink anymore. Fernpaw filters are top-notch, I change them once a month and have no problems.
I bought these for my covered litter box, and the filters fit perfectly. They keep it smelling fresh.
Good afternoon. Thank you for your review. For covered litter boxes, inserts like these are simply essential.
12 pieces in a pack, very good value. The inserts are easy to use and do an excellent job.
Our litter box is in a tiny storage room, and these inserts helped make the air in there much fresher.
I use them for a litter box house. They hold the odor, but they need to be changed more often than the recommendations say.
I would buy again. The charcoal filters handle odors between litter box cleanings really well.
Maine Coons need their litter box cleaned often, ours included, so I decided to try these Fernpaw inserts. The polyester feels dense and the charcoal granules stay put instead of spilling everywhere. It's close to 20 x 15 x 3 cm, which matched our plastic litter house without issue. The real selling point is the deodorizing — cat smell is basically gone from the apartment now. Simple enough that anyone could install it. Very satisfied overall.
Hello. Thank you for the detailed review. Large pets really do require a special approach to hygiene.
The 3 cm thickness lets you slide the filter into the slot without any extra effort, and it doesn't fall out.
These charcoal inserts saved the situation. The litter box no longer gives off unpleasant odors.
Hello. Thank you for your review. It's nice to hear that the product fully met your need.
The deodorizing function works without any complaints. Odors from the litter box no longer spread through the house.
The activated charcoal does its job; there is no smell at all between cleanings. Very satisfied.
The white and black color looks stylish,/master. The inserts are easy to use and do the job.
Hello. Thank you for the review. The replacement process really is intuitive.
The charcoal filters for the litter box really reduce odor. The package is large and will last almost a year.
Good afternoon. Thank you for your purchase. We're glad the product helped solve the odor issue.
We're in a one-room apartment, and the litter box house sits right in the hallway, so any smell used to spread through the whole place the moment the cat used it. Decided to give these Fernpaw charcoal filters a shot, and the effect was noticeable from day one — the hallway just doesn't give it away anymore. We're changing the filter element roughly every three weeks, which turns out to be plenty.
Hello. We appreciate the detailed review. We're very glad the product helped make your living conditions more comfortable.
Matched our covered litter box perfectly at close to 20 by 15 cm. Trimmed it down a touch and popped it in — no problems at all, very convenient.
Hello. Thank you for your rating. The material is easy to adjust to the required cartridge dimensions.
12 pieces will last a long time. I am completely satisfied with how the filters work; there is no smell from the litter box.
Hello. Thank you for your purchase. The large set provides a long-lasting supply.
Modern style, and none of our guests complain about the smell of the cat litter box in the apartment.
The white color with black inserts looks stylish. The deodorizing works excellently. Very pleased.
The charcoal inserts are legit. the color is stylish, the size fit the automatic litter box. rating five
Good afternoon. Thank you for the high rating. We're glad the filters fit the automatic model.
There is no smell at all between cleanings. But if the cat goes outside the insert, then it's already useless.
Just ordinary everyday use at home. Put it in and forget about odors for a couple of weeks.
Good afternoon. Thank you for your purchase. They are ideal for everyday use.
They fit into the cartridge like they were made for it, the size matched. They removed the smell from the apartment in a couple of hours.
Good afternoon. Thank you for your comment. We're glad the installation did not cause any difficulties.
I inserted it into the Fernpaw litter box cartridge. The deodorizing works, but the corners turned out to be too sharp.
Hello. Thank you for the review. For safe installation, the corners have factory stitching, but we will check the nuance you mentioned.
Bought these replacement filters for our British Shorthair's covered litter box. The deodorizing is genuinely strong — ammonia smell disappears completely between cleanings. She doesn't try to scratch at them either, which helps. A 12-pack should last close to half a year at our pace. The polyester feels reasonably dense, and the carbon doesn't shed when I pull the old one out of the cartridge. Would reorder without hesitation.
I use this for a covered litter box, and the smell is completely gone. Highly recommend buying this product.
Hello. Thank you for the recommendation. We strive to provide only high-quality products.
The black and white color looks neat. Deodorization in a small bathroom works flawlessly.
Would buy again. The activated carbon works much better than various aerosol sprays from the store.
Size-wise it's a good match for the litter box, roughly 20 by 15 cm, but the polyester feels a little thin and flimsy to me.
Hello. Thank you for your feedback. The material is intentionally chosen to be lightweight and porous for better airflow.
The covered litter box smells much better now. The carbon does a great job between cleanings.
Hello. Thank you for your feedback. Regular replacement of the filters really helps maintain freshness.
Our covered wooden litter box sits in the living room, and we used to dread having guests over because of the smell. Started fitting these Fernpaw filters into the top ventilation grille, and the panel matched the space well, close to 20 by 15 cm. Now nobody can tell where Musya's litter box even is. Changing it monthly, and one pack goes a long way. Completely satisfied, would buy again.
Hello. Thank you for the detailed review. We are glad the product helped create a comfortable environment in your living room.
12 pieces in a pack for this price is a total steal, they get rid of odors in no time.
Good afternoon. Thank you for your review. We try to maintain a balance between quality and affordability.
Would buy again without a second thought. Keeps things smelling fresh even in a very small space.
The carbon really works, there are no more odors in the apartment. I got these for a covered litter box, the size fit perfectly.
Hello. Thank you for your review. We are glad the filters do their job effectively in your litter box.
The polyester material lets air pass through to the carbon perfectly. Deodorization is top-notch.
Good afternoon. Thank you for your review. The breathability of the material really affects its overall efficiency.
The carbon really works, the smell in the apartment doesn't appear anymore. Fernpaw filters do a fantastic job.
Hello. Thank you for the review, we are glad the filters effectively solve the odor issue.
The activated carbon inside really works, the apartment smells fresh and clean again. Thanks to Fernpaw.
The carbon filters are dense and don't tear when installing them into the cartridge.
Excellent activated carbon, the smell between cleanings doesn't bother us anymore.
The filter cartridge is a standard size, and these Fernpaw replacement filters fit perfectly. They do the job well.
Hello. Thank you for your comment. The standard size allows them to be used with various models.
The hallway smelled fine for the first few weeks and then the smell came back. I do not think I should have to keep buying replacements to keep a filter working.
Hello. The carbon filters are consumables with roughly a 30-day service life; the interval is printed on the pack.
The carbon works flawlessly. Changing the filter is easy, making it great for everyday use.
We scoop often, so honestly the difference was small. I bought these expecting the box to smell of nothing at all, ever.
Bought this for my cat, and she's happy. The smell disappears as soon as the filter starts working.
I was really pleased by how easy they are to use. Open it, insert it, and you're done.
Hello. Thank you for your review. We try to make pet care as convenient as possible.
The white color doesn't yellow over time from moisture. The style is modern and unobtrusive.
Hello. Thank you for your review. The polyester is resistant to humidity changes inside the litter box.
They do a great job of maintaining a fresh scent. The enclosure no longer smells like litter.
Good afternoon. Thank you for your purchase and feedback.
The lightweight design doesn't weigh down the lid. They keep odors under control perfectly.
Hello. Thank you for your rating. The lightness of the filter preserves the integrity of the litter box fastenings.
These carbon filters fit my automatic litter box perfectly. I will definitely be ordering more.
Good afternoon. Thank you for your purchase. We are glad to have you as a regular customer.
I put it in the litter box enclosure, and my wife immediately noticed that the unpleasant odor trail was gone. Good product.
Good afternoon. Thank you for your comment. Activated carbon effectively absorbs volatile substances.
Our pet cat calmly uses the covered litter box, and we don’t smell anything thanks to the inserts.
They do a good job with deodorizing, but when I tried to trim off the excess, the filling started crumbling out.
Everything is as described, perfect for a cat. The activated carbon absorbs odors.
Hello. Thank you for your review. We’re glad the product features fully matched what was stated.
Fernpaw filters provide excellent deodorizing. There’s no cat smell in the bathroom now.
The description says 12 pieces, but in reality there were only two filters in the pack.
Hello. We apologize for the possible confusion. A Fernpaw brand package contains 2 replacement cartridges. The stated 12 pieces refers to the quantity in the shipping box.
Picked up a 12-pack for our two cats and swap them out on a regular rotation. These Fernpaw inserts genuinely filter the air well. Size fits the standard cassette fine, somewhere around 20 by 15 cm, and the mesh feels dense. Deodorizing performance impressed me — no cat urine smell at all. Good everyday product, I'll keep buying it.
Decent material, easy to cut with a knife if needed. They fit into the enclosure like they were made for it. I recommend them.
Good afternoon. Thank you for your comment. The sheet can indeed be easily adapted to the required format.
Helps between cleanings. The litter box doesn’t stink, and the air in the apartment is fresh and clean. Flawless.
Hello. Thank you for your purchase. Regular replacement of the inserts helps maintain fresh air.
Keeps the litter area fresh, the deodorizing really works. Very happy with the purchase.
Our Siamese uses the litter box in the bathroom, and mornings used to have a noticeable ammonia edge to them until we started using these charcoal inserts from Fernpaw. That problem is gone now. We swap them into the cassette on the lid roughly every four weeks, and the carbon handles the smell well the whole time. The polyester held up fine too — he tried clawing at the lid once out of curiosity and couldn't tear through it. Meant for daily use and that's exactly the job it's doing for us. We'll keep buying this brand.
They weigh only 50 grams, very light. But they still absorb odor brilliantly.
Modern filter design, hides odors between cleanings. I would buy again without hesitation.
Good afternoon. Thank you for choosing the Fernpaw brand. We’re glad the functionality met your expectations.
The black-and-white colors look stylish. The deodorizing works flawlessly.
Needed filters for an automatic litter box that wouldn't require cutting to size, and these worked out — sized close to 20 by 15 cm, they dropped right into the cassette. The carbon reliably keeps odor in check right up to the next cleaning cycle. We use it daily and haven't had a single complaint. Fully satisfied with this purchase; the pack of 12 should carry us for several months.
Good afternoon. Thank you for the detailed review. The standard dimensions really are very convenient.
Bought these charcoal filters from Fernpaw for Marta, my British cat, and her covered litter box. We're in a studio, so smell control really matters here. To their credit, the activated carbon does its job well — no smell between cleanings, and the air noticeably improved. My one gripe is the packaging: the outer box just holds two paper sleeves with six filters each, and pulling one out loosens the seal on the rest so they start airing out early. Sealing each filter individually would fix that. Still, it's a good product overall and I'll buy it again.
There are 12 pieces in the package, enough for almost a year. We change them once a month, and the litter area has become fresh.
The smell between cleanings disappeared; the activated carbon in the Fernpaw filters works reliably.
Hello. We appreciate your comment. We’re happy to provide an effective solution.
These fit our enclosure like they were custom-made for it, about 20 by 15 cm and 3 cm deep. They really do keep the odors contained.
Hello. Thank you for your purchase.
The deodorizing features really work; the bathroom smells fresh.
The smell from the litter box no longer bothers us between cleanings; the charcoal works excellently.
Hello. We appreciate your review. We’re glad the odor problem has been solved.
Living in a small studio meant litter box odor was a genuinely serious problem for us. We switched to these Fernpaw charcoal inserts after our old filters stopped cutting it, and the activated carbon actually delivers — smell used to fill the whole room, and now you'd barely notice unless you're right next to the enclosure. Every three weeks works out to be the sweet spot for changing them. Very happy with this, will reorder when it runs out, and having twelve in a pack right away is a nice bonus.
Good afternoon. Thank you for the detailed review. For studios, maintaining fresh air is truly very important, and we’re glad the filters helped solve this issue. We recommend replacing the inserts every 3-4 weeks for the best results.
The filters are fine for everyday use. It’s disappointing that they can’t be washed and reused.
Hello. Thank you for your review. Wet activated carbon loses its adsorbing properties, so the inserts must be replaced.
A set of 12 pieces is good value. It will last almost a year of use in our litter box enclosure.
Good afternoon. Thank you for your purchase. The bulk package is indeed more economical per piece.
Convenient to use in the enclosure. But the set doesn’t include any Velcro to attach them under the lid.
For my British Shorthair I'd tried another brand's filters before these, but smell still leaked out of the covered litter box regardless. Switching to these Fernpaw inserts fixed that completely — the activated carbon handles everything between cleanings. Swapping them is dead simple, no skill needed, and the lid closes without the filter bunching up anywhere inside.
Hello. Thank you for the detailed story about your experience. We are glad the product met your expectations.
Helps reduce litter box odor. There is a sufficient amount of activated carbon inside.
Good afternoon. Thank you for your purchase. The carbon filling is designed for effective absorption.
Assorted colors. I received black ones, but I wanted white to match the litter box enclosure.
Good afternoon. The item comes in two color variations depending on the batch. The functional characteristics of the carbon remain unchanged.
Leo, our Maine Coon, has his litter box in the hallway, and odor was a constant issue there until we tried these Fernpaw inserts. The carbon does exactly what it should — the hallway air is honestly fine now. We've kept up a monthly replacement schedule for four months running with no drop-off. Worth buying without a second thought given the price.
The polyester doesn't absorb moisture from the air. The carbon works as it should.
Good afternoon. Thank you for your review. The moisture resistance of the shell really does extend the lifespan of the insert.
The Fernpaw brand makes good products. The pet filters are high quality, I am happy with the purchase.
Thickness is 3 cm when folded, exactly as described. The litter box smells fresh between cleanings.
Ordered for an automatic litter box. The dimensions fit, but they sit too tightly in the cartridge.
Hello. Thank you for your review. The inserts have fixed dimensions; installing them in some models requires slight pressure.
The covered litter box doesn't give itself away anymore. The inserts really work.
Good afternoon. Thank you for your feedback.
The 12 pieces is a typo, my order had 2 as stated. Everything works, no smell.
The 3-centimeter thickness fits perfectly into the filter cartridge, nothing sticks out.
Good afternoon. Thank you for your review. The specified dimensions are indeed suitable for most standard models.
Smells used to pile up fast since our litter box is crammed into a small hallway. Gave these activated carbon inserts a shot and saw improvement by the second day already. Twelve in a pack, easy swap each time. Mars, our cat, didn't mind the change to his setup at all. Really happy with how the deodorizing works here.
Would definitely buy again. Slotted straight into our litter box cartridge at around 20 by 15 cm, and the carbon inside genuinely soaks up the odors.
Hello. Thank you for your review. We are glad the size fit your litter box.
Super easy to use, just pop one in and that's it. Size matched our litter box exactly, close to 20 by 15 cm.
Good afternoon. Thank you for your purchase. The specified dimensions are indeed suitable for most standard covered litter boxes.
They fit easily into the cartridge of the covered litter box and eliminate odors immediately. Great product.
Hello. Thank you for your purchase. The intuitive installation saves pet owners time.
Bought for an automatic litter box, everything fit without any issues. Odor is kept under control.
Good afternoon. Thank you for your feedback. We are glad the filters are compatible with your model.
Carbon inserts for covered litter boxes are a real find. 12 pieces in a pack, great price.
Hello. Thank you for your review. We are glad that the quantity-to-price ratio worked for you.
I used to buy them at a local store, but these from Fernpaw work better. The carbon is fine and evenly distributed throughout the polyester sheet. I put it in the litter box lid, and the fastener holds it tightly. In the bathroom, you can now breathe easily even on days when the cat uses the litter box right before we get home from work. Completely satisfied, would buy again.
Hello. Thank you for the detailed review. The structure really allows the carbon to be distributed as efficiently as possible.
Modern stylish design, doesn't ruin the look of the litter box enclosure. The color is neutral.
Good afternoon. Thank you for your purchase. We are glad the appearance of the inserts met your expectations.
Activated carbon is a lifesaver. Before, the smell would immediately drift into the hallway, now I don't smell anything at all.
Good afternoon. Thank you for your review. Carbon filters do an excellent job of neutralizing ammonia odors.
Simon, our Thai cat, has his litter box tucked into a very cramped hallway, and the smell used to spread through the whole apartment almost instantly after he used it. We switched to Fernpaw's activated carbon filters, placing them in the cartridge built into the covered box's lid, and change them roughly every three to four weeks. By the second day the apartment had already stopped smelling like a litter box — the air was noticeably better. The polyester breathes while still trapping odor thanks to the carbon inside. Genuinely useful for daily life.
They absorb odors well between litter box cleanings. Completely satisfied, will buy more.
Would order again. Came out close to 20 by 15 cm, fit well once I trimmed a little extra off with scissors.
Good afternoon. Thank you for your review. If necessary, the sheet can be easily adjusted.
The covered litter box now works as it should. The smell passes through the carbon and is neutralized.
Good afternoon. Thank you for your review. The carbon filter really works as an effective barrier.
We use it with a covered litter box, very convenient. The deodorization works flawlessly, I recommend it.
Hello. Thank you for the recommendation. We are glad the product's functionality met your expectations.
Size is right but they sit loosely in our slots and slip out when I clean. Small thing, but it happens every single time.
Good afternoon. Thank you, slot depth varies between litter box brands. We have passed this on.
The covered litter box no longer gives away where it is. It’s just a pity there are only 12 in the set.
The white and black colors go really well with the plastic of the litter box. Discreet and practical.
Hello. Thank you for the review. We chose universal colors to suit most interiors.
I would buy again. The polyester doesn’t get moldy from moisture inside the box. The cat is happy.
Good afternoon. Thank you for choosing Fernpaw. The material is indeed resistant to high humidity.
They fit compatible litter boxes without any problems. The activated charcoal does its job.
The filters handle odors between cleanings, and the litter area smells much fresher now.
Good afternoon. Thank you for your review. We’re glad the insert’s functionality helped improve your pet’s living conditions.
Good polyester, the charcoal granules don’t crumble out around the edges. Completely satisfied with the purchase.
The listed dimensions, about 20 by 15 cm, are spot on. Everything sits snug and stays firmly in place.
Good afternoon. Thank you for your purchase. Accurate dimensions really are important when choosing filters.
I buy these for an automatic litter box. The inserts work great, freshness lasts between cleanings.
I would buy again, the pack will last a long time. The activated charcoal neutralizes unpleasant odors from the litter box very well.
Good afternoon. Thank you for your purchase. On average, one filter lasts about four weeks.
The activated charcoal inside absorbs all the odors. The litter area is fresh now.
Hello. Thank you for your purchase. Charcoal filling really is one of the best absorbents.
Fernpaw charcoal inserts for covered litter boxes work great, the odors are gone.
Hello. Thank you for your purchase. We’re glad the product effectively solved your problem.
I would buy again, a worthy replacement for the original filters for an automatic litter box.
Does its job perfectly. The activated charcoal absorbs odors between litter box cleanings.
Hello. Thank you for your comment. The charcoal filter is indeed designed for the intervals between cleanings.
There is a bit of charcoal dust when unpacking, but they sit tightly in the litter box and absorb odors.
Hello. Thank you for the review. Before installation, we recommend gently shaking the insert to remove any production residue.
Sized right for our covered litter box, roughly 20 by 15 cm, and the deodorizing side of things works flawlessly.
Hello. Thank you for your review. The stated dimensions are universal for most covered litter boxes.
They handle ammonia really well. The cat eats wet food, and the smell used to be strong, but now everything is great.
12 pieces in the pack is good value. We change them once a month, and now the bathroom stays fresh.
Quality Fernpaw material. The replacement elements are easy to use and stay securely in the cassette.
Good afternoon. Thank you for the review. A snug fit in the cassette improves cleaning efficiency.
There are 12 pieces in the box right away. Enough for almost a year with regular replacement. I recommend them.
We're in a studio and the litter box sits right by the front door, so it used to be the first thing you smelled walking in. That's no longer an issue. These charcoal inserts do exactly what they claim — deodorizing is genuinely strong. We swap them roughly every couple of weeks, and instead of that ammonia edge, it just smells fresh. Ordering more.
Good afternoon. Thank you for the detailed feedback. For studios, it really is very important to use quality deodorizing.
White polyester with black charcoal flecks, looks neat. Easy to use.
The deodorizing function works brilliantly. The polyester mesh is strong and doesn’t tear during installation.
Was on the hunt for replacement filters for my British cat's covered litter box and landed on Fernpaw. The panel matched the cassette well, roughly 20 by 15 cm, and the activated charcoal keeps odor down noticeably between cleanings. A pack of 12 lasts quite a while. This kind of deodorizing makes a real difference in a small apartment. Easy to slot into the cassette too. Completely satisfied with the purchase.
Hello. Thank you for the detailed review. We’re glad the product met your expectations.
The style is modern and unobtrusive. It doesn’t attract the cat’s attention, and he stopped chewing the edges.
They keep the litter box area fresh, but only if the box is placed in a well-ventilated corner.
The covered litter box no longer smells before the next cleaning. Completely satisfied.
Hello. Thank you for your review. We are glad to provide comfort for you and your pet.
The black and white color is exactly as described. I inserted it in a couple of minutes, very easy to use.
Hello. Thank you for your rating. We strive to make the design of our products as practical as possible.
Modern style with nothing unnecessary, the filter just does its deodorizing job.
Good afternoon. Thank you for your comment. We tried to make the design as minimalist as possible.
Bought these for a compatible litter box. They are slightly too big by a few millimeters, I barely managed to fit them into the cartridge slots.
Good afternoon. Thank you for your rating. Size tolerances can vary slightly, we recommend slightly bending the insert before installation.
They fit perfectly in our covered litter box from a different brand. The air is fresh, I'm ordering a second pack.
Exactly 12 pieces in the pack, everything is neatly packed. They help keep the house clean.
Would buy again. The carbon really traps the odors, the litter box is in the hallway and is no longer a nuisance.
Hello. Thank you for your review. We are glad the filters effectively deal with odors in the hallway.
Not bad inserts, there's less smell. However, there are 12 pieces in a pack, which isn't enough for half a year.
Good afternoon. Thank you for your rating. The stated volume is designed for a standard replacement cycle of once every three weeks.
Carbon litter box filters are a real lifesaver in a small apartment.
Good afternoon. Thank you for your feedback. We are glad to be of help.
They fit my litter box enclosure. They eliminate odors in no time. Thanks Fernpaw.
Modern style, the white color looks clean. Deodorization is top-notch, I will buy again.
The litter box doesn't stink, the carbon helps. But the black and white design gets dirty from cat paws before installation.
Hello. Thank you for your review. We recommend installing the filter right before closing the litter box lid.
The polyester material seems fine, but the cat sniffed it for a long time and avoided the litter box at first.
Good afternoon. Pets can be cautious of new item smells. We recommend rinsing the filter with clean water and drying it thoroughly before installing it in the litter box.
Easy to use, just insert it and you're done. Keeps the litter box fresh.
Good afternoon. Thank you for your comment. The replacement process is indeed very intuitive.
My British Shorthair, Bax, started using the enclosed litter box, and the smell in our studio got pretty bad. Wasn't expecting much from these Fernpaw inserts honestly, but after slotting one into the cartridge on the lid, the air was noticeably fresher within a couple of hours. We stick strictly to a three-to-four-week replacement schedule now. On my third pack already, still completely satisfied, and I'd buy again.
Hello. Thank you for your detailed review. We are glad the product helped solve the odor issue in your studio.
This is a must-have for a litter box enclosure. The carbon eliminates litter box odors instantly.
Good afternoon. Thank you for your purchase.
The black and white color is weird, I have a white litter box and it doesn't look great. But otherwise, it filters well enough for a 4-star rating.
Bought a pack of 12 for a covered litter box. The polyester is durable, the carbon doesn't spill out, everything is super.
The filters are easy to use and they hold their shape well despite being thin.
Grabbed a pack of these for our Thai cat's automatic litter box, and I was relieved to see 12 filters included since that unit goes through them quickly. The panel — around 20 by 15 cm — sits well in the tray, and the activated carbon genuinely takes care of the ammonia smell. Three used up over two months so far, and results have been solid. That said, when I opened the box, two of the twelve filters were noticeably bent. Doesn't hurt how they work, but it left a slightly sour impression given how careless the shipping must have been.
Hello. Thank you for your detailed review and we apologize for the bent inserts during shipping. We are working on improving the packaging rigidity.
Would buy again. The inserts eliminate odors between cleanings. The cat eats dry food, now everything is fresh.
Good afternoon. Thank you for your purchase. Maintaining air cleanliness between cleanings is the main purpose of the inserts.
The activated carbon inside is fine-grained and doesn't spill out. The 12-piece pack is super.
Bought it for a covered litter box, the deodorization works excellently. There is almost no smell at all.
Hello. Thank you for your rating. Covered litter boxes combined with carbon give an excellent result.
I bought a pack of twelve, now it will definitely last a long time. The carbon traps odors excellently.
Good afternoon. Thank you for your review. A large pack really does last for a long time.
I would buy these again. The litter box house now always has fresh air thanks to the activated charcoal.
Good afternoon. Thank you for your review. We’re glad the air quality in your pet’s house has improved.
The white color with black charcoal inside looks neat. Completely satisfied, ordering a second pack.
A pack of 12 is very convenient. I change them as needed, and everything works like clockwork.
Good afternoon. Thank you for your review. It’s always useful to have replacement inserts on hand.
The charcoal absorbs odors excellently. The deodorizing works 100 percent.
Good afternoon. Thank you for your high rating of the activated charcoal’s properties.
There are 2 pieces in the pack, enough for a long time. Modern style and nothing unnecessary.
Hello. Thank you for your review. A set of two really is an optimal option for keeping a spare.
The deodorizing works 5+. Just what you need for a covered litter box, I recommend it to friends.
Hello. Thank you for your purchase and recommendation. We’re glad the product suited you perfectly.
Bought these for my older covered litter box. The size listed, close to 20 by 15 cm, checked out, and fitting it under the lid took only a couple of minutes. Base material feels like dense polyester — my cat climbed in and pawed at it a bit, and it held together fine. Ammonia smell is completely gone. Already through three of the twelve in this pack, changing every three to four weeks. Happy with the quality and will reorder the same batch when I run low.
Keeps the room smelling fresher. The cat does not try to pull the filter out of the cassette.
Took a while to find the right replacement elements for our automatic litter box — tried a few different brands before landing on Fernpaw as the most reliable. The polyester base doesn't turn soggy from the condensation that builds up inside the unit, and the charcoal keeps odor contained right up until the self-cleaning cycle runs. Three months in now and there's still no deformation — they're holding their shape just as well as day one.
Keeps the smell nice and fresh. Fernpaw makes quality products for pets.
The size matched, and the polyester quality is good. No more sharp smell after the cat visits.
Hello. Thank you for your comment. We’re glad the product met your expectations.
Dense, don’t fall apart in your hands during installation. They neutralize litter box odor 100%.
Hello. Thank you for your rating. Material strength was one of our priorities during development.
Fits compatible litter boxes 100 percent. The cassette model is standard.
Good afternoon. Thank you for your purchase. This cassette format is the most common on the market.
The dimensions are listed correctly, they fit my old litter box. The activated charcoal completely blocks the smell.
Hello. Thank you for your purchase. Always check the dimensions before ordering; we’re glad everything fit.
Easy to use and excellent at removing odors from the cat litter box. Five stars.
There’s almost no smell in the litter area now. The activated charcoal works flawlessly, and the cat is happy.
Our Maine Coon needs a genuinely large covered litter box, and the smell from it used to drift into the hallway sometimes. Started using Fernpaw filters and the charcoal layer inside the polyester keeps things under control between scheduled cleanings. Walking into the house doesn't come with that wince anymore. We use them daily as intended, changing once a month, and one 12-pack stretches close to a full year for us — nice not having to keep restocking constantly. Very happy with the purchase and will buy more when supplies run low. Takes just seconds to click into the cassette too.
Hello. Thank you for the detailed review. For large breeds with a heavily used litter box, regular filter replacement is especially important.
The inserts are easy to use, but in my case the smell still seeps into the hallway.
Hello. Deodorizing effectiveness depends on the room’s ventilation. We recommend checking the air circulation around the covered litter box and not placing it in closed-off corners.
Fernpaw makes good stuff. The cassette with this filter no longer stinks, everything is spot on.
They fit our litter box house. Completely satisfied with the purchase of these replacement filters.
The activated charcoal works perfectly. Once again I’m convinced I made the right choice.
Convenient thing. the filters really remove the cat litter smell in the bathroom where the litter box is kept
Hello. Thank you for your comment; we’re glad the product met your expectations.
I would buy these again. This isn’t a medical product, but a household necessity that works great.
The black color inside the litter box doesn’t look dirty. I change it once a month, everything suits me.
The inserts work like a charm. The charcoal absorbs well, and there’s no more cat smell in the house.
Good afternoon. Thank you for your purchase. The porous structure of activated charcoal effectively absorbs odors.
Exactly 12 pieces in the pack. Easy to change, the carbon doesn't get your hands dirty.
Hello. Thank you for paying attention to the details and for your purchase.
The polyester material feels nice to the touch and holds its shape. I would definitely buy it again.
They do an excellent job with odors in our litter box enclosure. The activated carbon really works between cleanings.
The litter box inserts really help. The smell from the box is gone, and the bathroom is now fresh.
Hello. Thank you for your comment. We are glad the odor issue has been successfully resolved.
The activated carbon in the filters really reduces the odor from the litter box. I am completely satisfied with the Fernpaw product.
It weighs only 50 grams, but it does a world of good. The carbon elements really help with the smell.
Hello. Thank you for your rating. The lightweight material doesn't weigh down the litter box structure.
Would buy again, the smell from the litter box is gone. Fernpaw makes quality products.
Would buy again, the 12 pieces in the pack last for a long time. The cat is happy with the fresh air.
Hello. Thank you for your rating. The packs are indeed designed to last for an extended period.
Everything works, you can really feel the freshness in the litter area. Easy to use and put in place.
Good afternoon. Thank you for your review. Ease of installation is one of the main advantages of these inserts.
We have a Sphynx, and her litter box lives in the bathroom, where the heat tends to make smells spread into the rest of the apartment. Decided to try carbon inserts and got a big pack of 12 to start. Fit one into the lid of the covered box — sized close to 20 by 15 cm and it slotted right in. By the second day the bathroom already felt noticeably fresher. Polyester feels dense and the carbon stays put instead of spilling. We're changing them every three weeks. Very satisfied with this Fernpaw product.
Hello. Thank you for the detailed review. High humidity can reduce the lifespan of the carbon, so make sure to replace it regularly.
Dense polyester, the carbon doesn't spill out. Would buy again without hesitation, everything is excellent.
Just insert it into the cartridge and you're done. Easy to use, they neutralize odors instantly.
Hello. Thank you for your rating. Ease of installation is indeed one of the main advantages of this model.
Activated carbon works much better than old paper filters. I will be buying more.
They fit the litter box enclosure perfectly. No gaps, fits like a glove, and there's no stink.
Hello. Thank you for your review. A tight fit is important for the carbon to work effectively.
The polyester material quality is justified. But the instructions on the box are printed in a font that is too small.
Good afternoon. Thank you for your comment. We will take your request regarding the font size into account in the next packaging run.
It maintains a fresh smell excellently. Bought it for a compatible litter box with no issues.
Good afternoon. Thank you for your purchase. Compatibility with most cartridge-based litter boxes is our advantage.
The dimensions turned out to be a pretty standard fit, close to 20 by 15 cm, so it dropped straight into our covered litter box cartridge with zero issues. Fernpaw came through here. Completely satisfied, and I'll be reordering once this pack is gone.
Hello. Thank you for your high rating and trust in Fernpaw products. We recommend changing the carbon filter every three to four weeks to maintain maximum odor-neutralizing efficiency.
They do a great job with bad odors, but it would be nice if they added a black frame to the set too.
Hello. Thank you for your review. We will pass your suggestion regarding the color range on to the production department.
The litter box inserts lay flat, the size was a perfect match. The smell is completely gone, highly recommend.
Matched to the millimeter, somewhere around 20 by 15 cm. And no odd smell coming off the filters themselves either.
Hello. Thank you for your high rating. The dimensions are standardized to fit the most popular litter boxes.
The polyester material feels nice to the touch and doesn't seem to break down from the moisture in the litter box.
Hello. Thank you for your review. The material is indeed resistant to humid environments.
They are perfectly suited for compatible litter boxes of the required size. They maintain freshness every day.
100% compatible with compatible litter boxes. The carbon filters save us from ammonia.
Hello. Thank you for your review. Activated carbon effectively neutralizes such odors.
12 pieces will last a long time. Fernpaw inserts really eliminate odors, the apartment is clean.
Good afternoon. Thank you for your review. We hope your supply of filters will last you for a long time.
The insert works. The activated carbon prevents ammonia smells from escaping the covered litter box.
The inserts are very easy to use; even a child could manage them. The deodorizing is top-notch.
Hello. Thank you for your review. We try to make products that are convenient for everyday use.
I would buy them again. The activated charcoal does an excellent job with odors between cleanings.
I would buy them again. The inserts handle litter box odor well. The cat doesn’t try to pull them out.
Hello. Thank you for your purchase. We’re glad your pet accepted the new element calmly.
The litter area smells much fresher now, especially when the filter is used in a small room.
Good afternoon. Thank you for your comment. This accessory really is essential for compact apartments.
The polyester filters turned out to be very durable and don’t tear during replacement. The smell no longer lingers in the apartment.
Good afternoon. Thank you for your rating. The polyester base is indeed designed to hold the charcoal securely.
The style is modern, nothing unnecessary. The polyester material breathes but keeps charcoal dust contained.
My pet cat didn’t notice the replacement. The litter house smells much better now.
Good afternoon. Thank you for your rating. A replacement going unnoticed by the pet is an important indicator.
Sturdy inserts. The material is polyester, master did not tear when installed in the lid.
Hello. Thank you for your rating. Polyester provides the necessary rigidity for the structure.
The 12-piece pack is very good value. It will last a long time, and the cat is happy.
Hello. Thank you for your review. Large packs really are convenient for regular use.
The replacement inserts saved our small apartment. Now we’re not embarrassed to invite guests over.
Good afternoon. Thank you for your feedback. We’re glad to help keep your home clean.
I buy these for everyday use. The smell of cat waste is gone. I’ll be getting more.
Good afternoon. Thank you for choosing our brand. The product is designed for daily use.
The filter for Fernpaw is very high quality. The color is white with black inserts, and it looks neat.
Good afternoon. Thank you for the high rating of the product. We try to make our products not only effective but also aesthetically pleasing.
The charcoal inserts for the litter box work. I put one in the litter house, and the smell disappeared completely.
It weighs only 50 grams, but there is enough charcoal inside to eliminate odor from the house.
Good afternoon. Thank you for your review. The light weight does not make the litter box lid heavier.
The polyester material does not absorb moisture, only odors. Very convenient and hygienic.
Only positives, the Fernpaw filters match the manufacturer’s description. I’m completely satisfied with the purchase.
I tossed the inserts into our automatic litter box, and the activated charcoal really eats up odors between cleanings.
Hello. Thank you for your review and for choosing Fernpaw products. We’re glad the filters are doing their job effectively.
I would buy them again. They’re easy to use and install in the cassette. The smell disappeared completely.
Stylish modern design and no extra chemical fragrances. Pure charcoal, I recommend it.
Hello. Thank you for your review. No artificial fragrances are used in the products, only charcoal.
Fit our litter box model perfectly, roughly 20 by 15 cm and 3 cm thick. The smell was completely gone after installing it.
Counted them, exactly 12 in the pack, no shorting us. Size matches the listing photo too, close to 20 by 15 cm.
Wasn't sure about going with non-original parts for our pricier litter box, but these inserts turned out fine. Polyester feels dense, and the charcoal stays put instead of crumbling at the edges. With two cats in the apartment, odor used to show up fast, but now the hallway doesn't smell like a litter box at all. Changing them roughly every three weeks. Completely satisfied and would buy again.
The charcoal really works; the smell disappeared completely. I change them once a month, and the inserts fit exactly into the grooves.
My apartment's small enough that the litter box sits right in the main room, so air quality really matters. Since switching to these Fernpaw filters, it's noticeably cleaner in here. Bucks, my cat, uses his covered house without any fuss, and odors between cleanings just aren't a thing anymore. I ordered two packs upfront since the polyester-and-charcoal inserts looked well made, and no charcoal dust flies around during a swap, which I appreciate. One filter lasts roughly three weeks with regular use for us. I'll keep buying these, very satisfied with the results.
Good afternoon. Thank you very much for the detailed feedback. We’re glad the inserts helped solve the odor issue in a small room. To maintain freshness, we also recommend airing the room regularly.
I inserted it into the cassette of the covered litter box, and the smell was noticeably milder by the evening.
I liked that the filters are thin and don't interfere with the litter box lid closing properly.
Good afternoon. Thank you for your feedback, this is indeed an important factor for covered litter boxes. We are glad the inserts fit without getting in the way of the lid.
The white side doesn't shed, and the black carbon inside stays neatly in place. Very easy to change.
Hello. Thank you for noting the neatness of the material and the ease of replacement. We are pleased that the filters are comfortable for everyday use.
I use this in my British Shorthair's enclosed litter box, and the small bathroom has become noticeably fresher.
Good afternoon. Thank you for your review, it's especially helpful to hear about your experience using it in a small space. The activated carbon really helps reduce odors between cleanings.
They fit into the automatic litter box without needing to be trimmed; the size turned out to be just right.
Hello. Thank you for your review regarding compatibility with automatic litter boxes. Before your next purchase, we also recommend double-checking the shape of the cartridge against your current filter.
I bought these for the activated carbon. With two cats, the difference after cleaning lasts much longer now.
Good afternoon. Thank you for the detailed feedback regarding two pets. We are glad the carbon inserts help keep things fresh for longer after cleaning the litter box.
Our covered litter box is in the hallway, so any smell announces itself immediately. Swapping the old filter for a Fernpaw one made a real difference — opening the apartment door in the morning doesn't come with that unpleasant surprise anymore. Masya, our cat, didn't even seem to notice the new insert and kept using the box like normal. Would order these again.
The material feels like dense polyester and doesn't fall apart in your hands when replacing it. I pop one into the covered box every few weeks, and the litter smell between cleanings has become much less harsh.
A pack lasts a long time; I keep a spare in the cabinet right next to the litter. The filters are lightweight and take up almost no space, so it's convenient to grab a few at once.
Our litter box has a narrow cartridge, so I was worried I'd have to cut it. Nope, I slipped it right in, and it sits perfectly. It doesn't magically eliminate smells, but it's become much more pleasant between cleanings.
The cat didn't try to paw the insert out through the grate, which means it doesn't have any off-putting smell.
Hello. Thank you for observing your pet's behavior. We are glad the filter didn't cause any extra curiosity for the cat and stayed in place.
Had to trim them with scissors to fit our box. A filter sold as universal should fit without me getting the scissors out.
I would buy these again. The polyester layer is pleasantly dense and doesn't tear during replacement. It contains smells excellently.
Awesome filters. Size-wise, the Fernpaw filters fit perfectly into our litter box cartridge; I didn't even have to trim them.
Good afternoon. Thank you for sharing your experience. We are so glad the size fit your litter box model without the need for adjustments.
Bax's litter box is crammed into our tiny bathroom, and the smell used to be constant, especially if we fell behind on cleaning. These Fernpaw inserts genuinely absorb the odor — instead of that ammonia hit, it just smells fresh now. On my third replacement already, and the cat stays relaxed, doesn't try chewing on the grate. Twelve per pack feels small at first, but it actually stretches to about half a year for us.
Hello. Thank you so much for the detailed story of your experience. We are glad the filters helped solve the odor issue in a small space. Wishing good health to your pet.
Got these for our covered litter box. Bax, my cat, is obsessed with fish-based food, and the smell that came with it was rough. These carbon inserts rescued the kitchen from that stench completely — I order two packs at a time now just to stay stocked.
Hello. We are glad to hear that the filters helped solve your odor problem. Thank you for choosing our store.
I would buy these again, the bathroom is fresh now, but the plates themselves are a bit on the thin side.
Musya, our British Shorthair, has her litter box in the hallway. Once I popped this filter into the lid, the smell dropped to almost nothing. A single pack is going to last us a good while.
Maine Coons eat a lot and use the litter box frequently. Before, the box would stink by the evening. I replaced the grill filter on the roof with this one, and it's become much easier to breathe. Five stars.
Studio apartment, ginger cat named Thomas — the litter box smell was making life miserable, made worse by the kitchen being right next to it. Tried these carbon cartridges as a fix, and they fit without issue. Odor gets neutralized within about half an hour of him using the box. Absolutely happy with how this turned out.
