Tetra Pond UV Replacement Bulb. UV light kills suspended green algae, preventing it from taking over your pond. Tetra Pond 5 Watt UV Replacement Bulbs are high-efficiency bulbs that work with Bio-Active Pressure Filters with UV and TetraPond UV Clarifiers to remove algae blooms within 5 days and keep your pond algae-free. They have an 8,000-hour lifetime and will effectively kill algae for up to 11 months.
Powerful UV clarifier keeps pond water clean and "green free"
UV light effectively destroys unsightly green pond water algae
Enjoy crystal clear pond water with minimal effort and maintenance