PetSafe Drinkwell Water Fountain for Pets. It consists of an automatic water bowl with a free-flowing stream of water and an adjustable flow rate. Circulation is quiet with the lowest setting and a light flow on the highest. Customizable flow allows you to control the flow of water in relation to the needs of the animal. This accessory promotes hydration… it encourages the animal to drink more and helps prevent pathologies of the urinary tract. The foam filter filters the water and captures hair and dirt… for bacteria-free water!