Keep your pets water fresh and clean with PetSafe Drinkwell Premium Replacement Carbon Filters. This premium filter has 6 separate carbon compartments to reduce the settling of carbon and enhance overall filtration. The dual-density polyester pad catches pet hair and debris, and the activated carbon made from coconut shells helps remove bad tastes and odors from the water. This filter is compatible with PetSafe Outdoor Dog, Everflow, Multi-Tier, Original, Platinum, Zen and Mini Pet Fountains. Trust PetSafe to help keep your pet healthy, safe and happy.