Quickly and easily connected to most canister filter setups the Fluval UVC In-Line Clarifier eliminates suspended bacteria and algae for a clear and healthy aquarium. Fluval CCFL technology attacks cloudy and green water by applying powerful DNA-destroying UVC light emissions. This natural process is chemical-free and will not affect beneficial surface-dwelling bacterial colonies that are already established. With its distinctive compact design the unit fits neatly within aquarium cabinetry without cluttering existing filtration systems.