Powerful functionThe filter removes magnesium and calcium from tap water. These minerals can accumulate in your pet's lower urinary tract and lead to urinary tract diseases, which is a common health issue for cats.NOTE: Our product is 5 inches and is not suitable for Catit water fountain. Before purchasing the product, please carefully check the size of the filter . 3 stage filtrationThe Pet Fountain Filter adopts 3 types of filtration (Resin, Charcoal, filter cotton fabrics), can assure the quality of the water and enhance the taste for your lovely cat and dog. Authenticated MaterialOur Pet Water fountain filter is made of polyester pad, Premium charcoal and Exchange Resin material, the external polyester layer on each filter captures hair and debris and the charcoal remove odors and eliminates bad taste. Easy to UseRinse filter with water thoroughly before use and replace filter every 2 to 3 weeks to keep water fresh, encourages your cat and dog to drink more to stay healthy. Easy to ReplaceWhen replacing the filter, be sure to clean the parts of the water supply unit to ensure cleanliness; When cleaning the filter, please do not use detergent, please rinse off the surface dirt with water Quantity delivered: 8 pieces