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Compatible with many models: our filters for cat fountains are compatible with different models of 2L/3.2L/4L stainless steel cat fountain. Please rest assured to buy our filter, because we are the original manufacturer with high-quality drinking fountain filter! Don't worry about the size, it is absolutely suitable for the above stainless steel cat drinking fountain models. Package list: the package contains 12 carbon filters and 12 round black foam filters. Three-layer filtration: the cat drinking fountain filter is made of high-quality activated carbon and cotton layers, which form a triple filter system that effectively removes hair and heavy metals and improves the taste of the water. Let your pet drink clean and fresh water all day, it will increase water absorption and reduce the risk of urinary tract infections. Regular replacement: the water fountain for cats must be replaced with a water filter every 4 weeks. (In hot weather, bacteria are more likely to multiply. Please change the carbon filter every 2 weeks and the foam filter every 2 months to keep the water fresh. Reminder: To prevent activated carbon dust (which does not harm your pet) from falling into the water, place the replacement filter in water for 5 minutes before use and then rinse it thoroughly under running water.