Replacement filter for Fresh and Clear 2l drinking fountain for cats 3-pack The drinking fountain: Circulating water provides your pet with fresh tasting, cool, filtered drinking water with a variety of health benefits through its increased oxygen intake. By encouraging your cat to drink more water, you are helping them to maintain proper kidney function. This can help to reduce the risk of crystal formation and urinary tract disease (FUS). You can also order a replacement filter here. It is recommended to change the water weekly to avoid possible limescale deposits. Disassemble the pump regularly and carefully remove foreign bodies or mineral residues from the inside and descale if necessary.