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No More Green Water! TetraPond® GreenFree™ UV Clarifiers provide permanent control of suspended algae which cause green water. It removes heavy algae blooms (usually within 5 days) and keeps the pond algae free. This means no more green water while reducing pond maintenance. Each unit is compact, durable, easy to install and energy efficient. Features: High clarity quartz glass tube - Includes mounting brackets -Minimum bulb-to-water-jacket distance for efficient water treatment - Weatherproof power cable - Transparent inlet-outlet allows for easy viewing of flow rate and bulb function - Delivers full power from PL-S high efficiency Ultraviolet bulb (included).