TetraPond Green Free UV Pond Water ClarifierKeep your pond Green Free with our TetraPond Green Free Ultraviolet Water Clarifier. TetraPond's dependable clarifiers use ultraviolet light to destroy the reproductive ability of suspended algae. Dead algae will clump together into particles large enough to be removed by filtration, leaving the pond cleaner and clearer. Green Free Clarifiers usually remove heavy algae blooms within five days and keep the pond algae-free. Easy to conceal and durable the TetraPond Green Free Ultraviolet Water Clarifiers install in minutes for your convenience.The Pond Water Clarifier features:UV Bulb (made by Phillips) effective for 11 months of continuous operation.High-clarity quartz tube.Stainless steel insert reflective surface increases UV exposure. Prevents internal degradation of plastic housings.Mounting brackets.Includes fittings.Quick-release couplings.