Fresh water is just a sip away with the PetSafe Drinkwell Replacement Carbon Filters. Each filter has 50% more carbon than generic brands for longer-lasting filtration. The activated carbon is made from coconut shells and helps refresh the water, keeping it tasty and clean for your pet. This filter is compatible with PetSafe Drinkwell 1/2 Gallon, 1 Gallon, 2 Gallon, Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside and Creekside Pet Fountains. Trust PetSafe to help keep your pet healthy, safe and happy.