Xiaomi Smart Pet Fountain FilterWith four-stage efficient deep filtration, fine particles, hair and chlorine residues, including Ca and Mg ions, are effectively captured and filtered, improving the taste of the water while softening and purifying it to ensure the health of your pet's urinary tract.Clean, healthy water for petsThe filter frame and PP membrane meet food grade requirements, ensuring safe water for pets.Mi Home/Xiaomi Home appIt is recommended to change the filter and filter unit once a month for better filtering results. Pair with the Mi Home/Xiaomi Home app for timely filter replacement reminders.