Package ListYou will receive: 10 * catit cat water fountain filter, 1 * cleaning brush. These filters are hygienic and clean for your use and replacement needs, providing safe drinking water for your pet. Quality MaterialThe upgraded cat fountain filter is made of PP cotton, activated carbon and resin, which can effectively remove hair, heavy metals and improve the taste of water. The cat water fountain filter provides clean drinking water for your pet, helps increase their water intake and reduces the risk of urinary tract infections in your pet. Easy to UseTo prevent activated carbon dust (which does not harm your pet) from falling into the water, soak the catit cat water fountain filter in water for 10 minutes before washing. to use and rinse it thoroughly under running water before using it. Depending on how often your pet drinks and the number of pets using the fountain, it is recommended that the filter be changed every 2-4 weeks. CompatibilityThe cat water fountain filter is designed to be used with pet water fountains to keep water running and fresh. The catit fountain filter is only compatible with the 43717 Catit Pixi 2.5L cat waterer. The filter size is 84mm*84mm. Please check your fountain model before purchasing.