The Deluxe Fresh Flow is a purifying pet fountain providing filtered water throughout the day. Perfect for multiple cat or dog households, this award-winning fountain features continuous circulating water & a unique, patented no-splash water-slide. The re-circulating flow & filter provides naturally cool & oxygenated water, attracting pets to drink more in order to help promote their health & well-being. Each unit comes with a replaceable charcoal filter. Change filter every 30 days to ensure freshness.