Tetra GreenFree 1 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. 9 watt, for ponds up to 1800 gallons, maximum flow 900gph, accepts 3/4" or 1" or 1 1/4" hose. UV bulbs have an 8000 hour life, manufacturer recommends replacing after 11 months of continuous use. 3 year warranty.