TotalPond 800 GPH Pump with UV Clarifier The 800 GPH Pond Pump with UV Clarifier is ideal for medium waterfalls up to 7 ft. tall. With a maximum pumping height of 11.5 ft. at 0 GPH, this energy-efficient pump helps circulate the water in a pond. This 2-in-1 pump, with an integrated 6W UV Clarifier, purifies and takes the green out of pond water. As water passes over the UV bulb, it is cleaned of the microorganisms that cause green, murky water. We recommend changing the bulb annually. TotalPond Pumps with UV Clarifiers come with an adaptor that features a built-in adjustable flow control to fine-tune the flow rate and help you achieve your desired water effect. New Hybrid Pump Technology,This pump comes with an adjustable flow control which allows it to pump between 700-800 GPH Built in UV Clarifier 11-1/2-Feet max lift 16-Feet cord Fits 3/4" tubing