Carl & Earl Activated Carbon Filters
Free Shipping - 60 Day Returns - 2 Year Warranty
Keep the water your cat actually wants to drink.
Carl & Earl's activated carbon filters remove chlorine, odors, and impurities — so every sip from your fountain tastes as fresh as the first day you filled it.
Why replace your filters regularly:
- Cleaner taste — activated carbon absorbs the chemicals tap water leaves behind
- Healthier hydration — reduces buildup that can put cats off drinking altogether
- Maintains flow — a clogged filter slows the pump and disrupts the gentle stream your cat trusts
- Protects the fountain — keeps the basin and pump running longer
- What's in the box: 8x Activated Carbon Filters
Fits: Carl & Earl Stainless Steel Cat Fountain
Usage: Replace monthly for best results. One pack = 8 months of clean, filtered water.
Happy cats, happy customers.
Hesitated on the price at first but honestly it's worth every penny. My cat ignored her water bowl for YEARS! she's been drinking from this every single day since it arrived.
Verified Customer
Really impressed with the build quality. Feels solid and premium, nothing like the cheap plastic ones I've tried before. Easy to clean too which was a big one for me.
Verified Customer
Wasn't sure my cats would even go near it. Within an hour they were drinking from it and haven't stopped. Wish I'd bought one sooner.
Verified Customer
Frequently asked questions
Will the suction cups actually hold?
Yes — and we engineered them specifically because this is the number one concern with any window perch. The Carl & Earl Aerial Hammock uses heavy-duty twist-lock suction cups rated to hold up to 40lbs on any clean, flat glass surface. The twist-lock mechanism creates a compression seal that standard push-on suction cups can't match. For best results mount on clean, dry, flat glass and press each cup firmly before twisting to lock. We recommend checking the cups periodically in warm or humid environments where glass expansion can slightly affect hold.
Will my cat actually use it or ignore it like everything else?
Cats ignore things that don't satisfy an instinct. They don't ignore elevated window positions. Height is one of the deepest hardwired drives a cat has — it's where they feel safe, in control, and completely at ease. Most cats discover the hammock within the first day simply because the window draws them there naturally. If your cat is hesitant at first, placing a familiar blanket or a small treat on the surface for the first few days is usually enough to get her comfortable.
Is it hard to install?
It takes about five minutes and requires zero tools. Find a clean flat window, press each suction cup firmly against the glass, and twist to lock. The wire frame adjusts to hold the sleeping surface at the right height and angle automatically. No drilling, no screws, no permanent changes to your home. If you can press and twist, you can install it.
What windows does it work on?
Any clean, flat glass surface. Standard single or double pane windows, sliding glass doors, and floor to ceiling glass panels all work perfectly. It does not work on textured, frosted, or curved glass surfaces as the suction cups need full contact with a smooth flat surface to create a proper seal.
Will it damage my window or wall?
No. The suction cup mount leaves zero marks, residue, or damage on glass. There is no drilling, no adhesive, and no permanent hardware involved. It installs and removes cleanly without any trace, which also makes it easy to move between windows or take down for cleaning.
How much weight can it really hold?
Up to 40lbs. The reinforced metal wire frame and heavy-duty suction cups are both rated and tested to that capacity. For context, even large breeds like Maine Coons and Ragdolls typically fall well within that range. If your cat is above 40lbs we'd gently suggest the weight limit is the least of your concerns.
What if my cat is too big or too small?
The 21 x 12 inch sleeping surface comfortably fits most cats including larger breeds. The hammock sits flush and stable regardless of where your cat positions herself on it, so smaller cats have just as much security as larger ones. The 40lb weight capacity means almost any domestic cat can use it safely and confidently.
What if my cat doesn't like it?
We offer 60-day returns, no questions asked. But in our experience the cats who don't immediately take to window perches are almost always ones who just need a few days to discover it on their own terms. Cats don't like being introduced to things — they like stumbling across them. Put it up, leave it alone, and let her find it herself. Most owners are surprised how quickly that happens.
From Carl & Earl.
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Every product in our store gets the Carl and Earl test. If they wouldn't use it, we don't sell it.