TetraPond UVC-9 GreenFree UV Clarifier, 9W (1072031)
TetraPond UVC-9 GreenFree UV Clarifier, 9W destroys suspended algae and is designed for ponds up to 1800 gallons. Please note that this product may only ship via UPS dimensional weight, which is above its actual weight.
Great for the price.
This works really well and is a better deal that similar products.