Tetra UVs clears your pond of unsightly floating algae in as little as 8 days. Kills algae quick with a UV lamp and stainless steel reflector. A quartz sleeve helps protect the lamp from debris. Easily see when the lamp is on with the viewing window. Lamps last up to 11 months of continuous use. Includes 3/4″, 1 and 1 1/4″ ID stepped hose connector. 18 ft. power cord and weather resistant housing.