Tetra GreenFree 2 UV Clarifier

Ultraviolet light destroys suspended algae, the dead algae clumps together in particles large enough to be removed by filtration. Easily installed. Hose Fittings included. 18 watt for ponds up to 4400 gallons, maximum flow 2200 gph, accepts 1" or 1 1/4" or 1 1/2" hose. UV bulbs have an 8000 hour life, manufacturer recommends replacing after 11 months of continuous use. 3 year warranty.