Pond filter maintenance is now made even simpler with an automatic cleaning system. The versatile range of sizes works for most pond volumes and offers the option of installation above or below ground level. The easy-to-maintain pond filters offer combined UV and Biological Filtration for crystal clear purified water. The patented Powerclenz automatic cleaning system is unique in that by twisting a knob, the pond filters automatically cleans itself. Simply turn the tap to position "Clean", and the foam will be squeezed by up to one thousand pounds force through water pressure, forcing out pond sludge. Features: Easy installation above or below ground - UV Chamber - Easy to Replace UV Lamp - UV Lamp-on indicator - Settlement Chamber - Profiled Filter sponge for mechanical filtration (supplied) - Fish Mate SUPRA biological filter media (supplied) - Lid secured by single clamp ring allows easy access for filter maintenance. Max Pond Size: 2000 gallons, Recommended Flow: 750-1300 GPH, Inlet/Outlet Size: ¾”, 1” or 1-1/4” Barbs, Dimensions: 15-1/2”L x 11”w x 17”H.