Simple yet flexible uv clarifier designed to interoperate with all filter systems,. Helps in the reduction of algae and phytoplankton, as well as limiting the growth of harmful pathogens.. The compact design allows for easy installation. Uick-lock ballast head makes changing the uv bulb a breeze. Uv operation can be safely monitored through the included large aperture viewer.. No extra plumbing needed - the clarifier simply hooks onto the filter box with all accessories included..