DESC: The Drinkwell Pet Fountain filters and aerates continuously moving water to keep it much fresher than standing bowl water. Cats, ferrets and small dogs love the free flowing fresh water the Drinkwell provides. The Drinkwell Pet Fountain is veterinarian designed and recommended by vet urinary specialists. It encourages water intake and proper hydration which makes pets healthier and is especially beneficial in cats with kidney or urinary tract disease. Features an adjustable flow rate, 6 cup bowl capacity, 6 foot electrical cord. charcoal filter to absorb unwanted tastes and odors, and can be expanded to hold an additional 6 cups of water by purchasing the optional refill accessory.