The Drinkwell® Zen Fountain offers your pet 1 gallon of fresh, filtered water in a stylish stainless steel bowl. A 3-layer charcoal filter removes bad tastes and odors from the water. The extra-wide, patented free-falling stream draws oxygen into the water, making it more appealing to drink from. Constant circulation of the water also inhibits bacterial growth between cleanings. The wide stainless steel drinking bowl is hygienic and easy to clean.