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 remove bad tastes and odours from the water, keeping it fresh and clean for your pet. This filter is compatible with PetSafe® Drinkwell® 1.8 Litre, 3.7 Litre, 7.5 Litre, Butterfly, Pagoda, Stainless 360, Sedona, Seaside and Streamside Pet Fountains.