Precision & Ease: The cat water fountain filters replacement measure 3.2 x 3.1 x 5.5" (upper width x lower width x length) for an accurate fit and easy installation High Compatibility: These charcoal filters for cat water fountain compatible with PetSafe Drinkwell Platinum(168 oz/5L), Outdoor Dog(450 oz/13L), Multi-Tier Pet(100 oz/3L), Everflow, Original, Zen, and Mini pet fountains Advanced Filtration: Saturated with premium coconut shell activated carbon and non-woven fabric, these cat fountain filters replacement isolate hair & residue, remove impurities, particles, heavy metals & odors, and soften tap water. Keeps water clean, fresh 24/7, boosting pet hydration Enhanced Filtration: Notice the difference with our unique six-compartment activated carbon design that significantly boosts filtration efficiency. Our pet fountain filter replacement contains more carbon than generic brands for longer-lasting cleanliness Pet Health Protection: By improving water quality, these pet water fountain filters play a crucial role in protecting pets' urinary health Steady Flow, No Leaks: Clog-free, steady water flow prevents overflow & keeps floors dry. Leak-proof design—won't easily leak carbon, plus durable & long-lasting Premium Materials: Made with high-quality materials, safe and odorless, built for reliable filtration; lasts 2 to 4 weeks per use depending on pet count Easy to Clean & Replace: Simply soak the cat fountain replacement carbon filters for 5 minutes and rinse for 30 seconds before use cat water fountain filters replacement