50% More Carbon Filters - WWVVPET branded filters contain 50% more carbon than most filters on the market for better and longer-lasting filtration which can help to keep away from some diseases in pets.Size: 5.1 x 0.4 inch | Triple Filtrations - Top quality cotton and premium active carbon help to get rid of chlorine, impurities and odors, catch hair and debris,soften water, make water in the fountain fresher, better-tasting.The better-tasting water will encourage your pets to drink more, helping them replenish moisture and keep healthy | Scope of Appliation - (Not compatible with Catit brand pet flower fountains) Pet water fountain replacement filters compatible with these brands of 81oz/2.4L Round Pet Water Fountains: Comsmart, Wonder Creature, Vekonn, Beacon Pet, Shinea, BOBEastal, isYoung , etc. | Frequency of Replacement - We suggest to replace it 2-4 weeks to keep the water fresh and clean..(Replace more frequently with multiple pets using) | 【Note】: To help prevent the charcoal dust from shedding, please rinse the filter with water thoroughly before use, providing the clean water for cats and dogs. Contact Us: Any problem, please contact us by email or from Amazon for help instead of leaving a rating.