The Fluavl FX UVC In-Line Clarifier quickly and easily connects to all canister filters to eliminate suspended algae for a clear and clear aquarium. With unique CCFL technology, the Fluval FX UVC bulb runs cooler to last up to 2X longer than traditional lamps. It attacks green and cloudy water by applying powerful, DNA-destroying light emissions at a precise 253 nanometer wavelength. This natural process is chemical-free and will not affect beneficial, surface-dwelling bacterial colonies that are already established.Fluval FX UVC In-Line Clarifier+ powerful UV-C clarifier for aqauriums up to 1500 l+ effectively eliminates suspended algae in the water column for a crystal clear aquarium+ compatible with Fluval FX Series filters and competitive canisters+ can be directly connected to the FX filters using connector tube (accessorie)+ 25 to 16 mm hose adapters included+ unique CCFL bulb technology runs cooler than traditional lamps to last 20,000 hours (over 2 years of continuous use)+ als