TetraPond UVC-5 GreenFree UV Clarifiers For Up To 660 Gallons 5-Watt
4 AVAILABLE SIZES: For ponds up to 660 gallons, up to 1,800 gallons, up to 4,400 gallons and up to 8,800 gallons. HIGH-EFFICIENCY UV BULB: Includes UV bulb for up to 11 months of continuous operation.