TetraPond Replacement Bulb For GreenFree UV Clarifier, For Clean And Clear Ponds, 9-Watt, 1 Count (Pack of 1)

About this item REPLACEMENT BULB: For use in TetraPond GreenFree UV Clarifier to control heavy algae blooms in ponds and water gardens and keep water clean and green-free ULTRAVIOLET LIGHT: Destroys the reproductive ability of single-celled algae ANNUAL MAINTENANCE: Replace bulb every pond season for continued algae control HIGH-EFFICIENCY: For up to 11 months of continuous operation 4 AVAILABLE SIZES: 5 watts for ponds up to 660 gallons; 9 watts for up to 1,800 gallons; 18 watts for up to 4,400 gallons; and 36 watts for up to 8,800 gallons