The Filtoclear pressurized filter has an integrated UVC for improved clarity of pond water. There is a indicator light for UVC function monitoring. Easy Clean technology for simple and convenient cleaning without having to open the filter. The Filtoclear can be installed either above water level or recessed into the ground beside the pond up to the filter lid. Filtoclear should not be used with a pump that that produces over 17' of head. Filtoclear 3000 Pressurized Filter w/UV: Max. Pond Size - 1500 gal. (Ponds with plants/ *Average Fish Stocks). Max. Pond Size - 750 gal. (Ponds with plants/ Koi/ *High Fish Stocks). Max Operating Pressure - 7.25 psi / 17ft. of head. Flow Rate - 2000 GPH. Type - Pressurized External Filter. Inlet / Outlet - 1 1/2" - 2" Threaded and Schedule 40 (PVC). UV Light - 18 Watts. Dimensions - 15" x 20". Warranty - 2 Year. *Average Fish Stock- Less than 10" of fish per 100 Gallons. *High Fish Stock - Koi or more than 10" of fish per 100 Gallons.