Drinkwell Replacement Foam Filter for Stainless 360, Lotus Pack of 4 Filters Total Replacement Foam Pre-Filters trap any large debris and hair in the water Providing cleaner water to your pet Foam filters help keep the pump cleaner in between cleanings and maintain the fountain's flow rate Total of 4 filters - compatible with Drinkwell Lotus, Avalon, Pagoda and Stainless Steel 360 fountains