Introducing U.V. Clarifiers to your system will give you the best possible water clarity. As algae passes through the unit, the U.V. light bleaches chlorophyll from the plant. The chlorophyll then sticks together and lodges into the biological filter to decompose. It then turns into nutrients and is consumed by beneficial bacteria that renders the nutrients harmless to pond life. Features & Benefits: * Clarifies water * Installs in-line as a stand alone fixture * Light tube unit can be installed in CPS Biological Filters * Multi purpose & versatile, can be added to any new or existing system * 6lbs For medium ponds 400 -1000 Gallons