The Cat Mate Pet Fountain constantly filters around 2 litres of water to ensure that its pure and fresh for a cat or small dog. This unique multi level design maximises the appeal of drinking with plenty of water movement to ensure naturally oxygenated cool water throughout the day. The re-circulating water provides fresh-tasting, cool, filtered water for pets with a multitude of health benefits including the reduction of crystal formation and urinary disease (fus). Encouraging your pet to drink more water helps promote health and well-being. Key Benefits: i.p.s. (isolated pump system) for super-quiet operation Polymer carbon filter for water purification (replacement cartridges available) Easy to clean Dishwasher-proof bowls.