Keep your pets water fresh and clean with PetSafe Drinkwell Replacement Carbon Filters. The duo-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.