Drinkwell Replacement Filters for Premium Platinum Pet Fountain, 3 Count, 12 Pack High-quality filters are designed exclusively for use in the Drinkwell Hy-drate H2O pet water fountains. Duo-density polyester pre-filter prevents hair, debris and sediment from entering the pump or water reservoir. Activated carbon removes bad tastes and odor for fresh, clean water your furry friend will love. Changing the filter regularly also reduces wear and tear on the water pump to help prolong its useful life. Available in convenient 3-count and 12-count packs; each filter provides two to four weeks of filtration.