The Catit Drinking Fountain Replacement Carbon Filter Cartridge is a great way to help keep your cat’s drinking water clean and fresh. This cartridge works to collect debris, food and sediment from your cat’s water, and it also helps reduce odors and impurities in the water. The blue, white design of this cartridge is sure to catch your cat’s attention, and it makes it easy to find when you’re searching for the perfect place to drink.