TetraPond GreenFree Ultraviolet Clarifiers is a product listed under the TetraPond brand. Protect%20Your%20Pond%20Against%20Green%20Water%0ABuilt%20to%20Last%20With%20Rugged%20Design%0AKnow%20Your%20UV%20is%20Working%20With%20the%20Viewing%20Window Specifications and pricing on this page reflect the data published by the source retailer at the most recent catalog refresh. Verify the current listing on the retailer page before purchase.