The Drinkwell Pet Fountain is a great way to show your pets just how much you care. Simple and Safe. And proven to benefit your pet's health. Our research shows that one of the best ways to improve your pet's health is to get them to drink more water. And the best way to do that is with the Drinkwell Large Capacity Pet Fountain which holds over 2.25 gallons of cool water. By using a 5-inch falling stream of water, the Drinkwell Big Dog Fountain continually aerates your pet's water with healthful oxygen. A charcoal filter also removes bad tastes and odors, giving your pet the best possible - and most appealing - way to stay hydrated! Buy all of your supplies in one stop at Curbstone Setters. We offer the Additional Capacity Reservoirs in 50 oz and 70 oz sizes, 3 pack replacement filters and the Drinkwell Cleaning Kit.