Fluval UVC In-Line Clarifier with Replaceable Bulb - up to 100 US Gal (400 L)Quickly and easily connected to most canister filter setups, the Fluval UVC In Line Clarifier eliminates suspended bacteria and algae for a clean and clear 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