Triple filtration cat fountains: in addition to maintaining water fresh through circulation, this cat water fountain features 3 effective filtrations, including non-woven fabric, activated carbon, and ion exchange resin, which could absorb hair and debris, soften the tap water, and eliminate smells. There is no need to routinely refresh the water in the visible and large capacity 2l pet water fountain, which is perfect for cats, dogs, and other indoor pets.