TetraPond UVC-5 GreenFree UV Clarifiers For Up To 660 Gallons, 5-Watt

UV CLARIFYING LIGHT: Ultraviolet clarifier controls heavy algae blooms in ponds and water gardens and keeps water clean and green-free.HIGH-EFFICIENCY UV BULB: Includes UV bulb for up to 11 months of continuous operation.REFLECTIVE SURFACE: Includes reflective stainless-steel insert that increases UV exposure.LIMITED WARRANTY: This UL Listed product features a 3-year limited warranty – see packaging for full details. Assembly Required.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.