The Petmate Deluxe Fresh Flow Pet Fountain is a purifying pet water fountain designed to keep your pet cool and hydrated, especially during the warmer months. Pet parents and pets appreciate the patented slope design that provides a natural continuous flow of circulating filtered, oxygenated water to ensure that your dog or cat stays hydrated with a unique patented no splash water slide. Support your pet's health and wellness with this innovative water fountain. Continuous running water attracts your pet and encourages them to drink more water. Holds a large amount of water and is ideal for multiple cat or dog households. The quietly running fountain plugs into a standard household AC outlet. Automatically release more water when needed. Replaceable charcoal filter (change filter every 30 days to ensure freshness). Large has a 108 oz. cup capacity and the Jumbo a 216 oz. cup capacity.