Precise & Easy Fit: Cat water fountain filters replacement measure 3.0 x 3.1 x 5.4"(upper x lower x length) – designed for seamless installation Wide Compatibility: These charcoal filters for cat water fountain are compatible with PetSafe Drinkwell Platinum(168 oz/5L), Outdoor(450 oz/13L), Multi-Tier(100 oz/3L), as well as Everflow, Original, Zen, and Mini pet fountains Advanced Filtration: Pet fountain filter replacement are saturated with premium coconut shell activated carbon and non-woven fabric. They effectively isolate cat hair & food debris, remove impurities, particles & odors, and soften tap water. Keeps water clean, fresh 24/7, boosting pet hydration Pet-Friendly for Health: Filters out odors & contaminantsto improve water taste. Encourages cats & dogs to drink more, supporting urinary tract 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 filter