The jebao cbf-4000 pressurized filter has an integrated 13-watt uvc for improved clarity of pond water. There is an indicator light for uvc function monitoring. Easy clean technology for simple and convenient cleaning without having to open the filter. The cbf-4000 can be installed either above water level or recessed into the ground beside the pond up to the filter lid. Recommend pump size: 500-1500 gallon per hour.