12 Pack Cat Water Fountain FilterIncluding 12-pack of pet fountain replacement filters with separate plastic sealed package(br)Highly effective filterComposed of high quality cotton layer, activated carbon and Ion Exchange Resin(br) High effectively to filter hair, heavy metals improve the taste of the water(br)Guarding Pet Health It is used with pet water fountain to increase the drinking water for pet and helps to reduce the risk of urinary tract infections(br)Wide CompatibilityCompatible with our 84oz/2(br)5L Pet Fountain, also with other pet drinking fountains of same size(br)NoteIn order to prevent the dust on the filter surface falling into drinking water, please rinse filter with water before use(br) And replace filter every 2-4 weeks(br)