The Uahpet 6 Layers Circulating Filter Helps Filter Out Unclean Substances, Like Dirt And Cat Hair, From Your Cat’S Drinking Fountain. Your Cat Can Enjoy Fresh, Clean And Odor Free Drinking Water. By Filtering Out Excess Minerals Present In Tap Water, The 6 Layers Circulating Filter Helps Reduce The Risk Of Urinary Tract Diseases, Which Are Common In Cats.