Patriot Bio Pro 4000 Pressure Filter with Built-In 24 Watt UV for Ponds to 4,000 Gallons Maximum Pond Size4,000 Gallons for Water Gardens or 2,000 Average Fish Load (Under 50 lbs.) & Pump Flow Rates 2,000  4,200 Gallons per Hour 2 Stage Mechanical Filtration Removes Coarse & Fine Floating Particulate & Bio Ball Biological Filtration Cultivates Bio Ball Biological Filtration Cultivates Beneficial Bacteria Which Converts Ammonia And Harmful Waste Into Healthy Nitrates That Promote A Healthy Pond Environment & Built-In Clarifier With 24 Watt UV Bulb Kills Free Floating Algae Glowing Monitor Indicates UV Light Is Functioning Properly & Visible Indicator Signals When Pressure Filter Requires Backwashing & Heavy Duty, Watertight Housing Is Easily Accessible For Filter Maintenance Can Be Partially Buried To Conceal Filter & Inlet/Outlet Barbs Accept Multiple Hose Sizes -- Electric: 120 Volts, 60 Hz & Cord Length 23 Feet