The Petmate® Deluxe Fresh Flow® is a purifying pet fountain providing filtered water throughout the day for your cat. Perfect for multiple cat households, this award-winning fountain features continuous circulating water and a unique, patented no-splash water-slide. The re-circulating flow and filter provides naturally cool and oxygenated water, attracting pets to drink more in order to help promote their health and well-being. Each unit comes with a replaceable charcoal filter. Change filter every thirty days to ensure freshness.