Cristal-clear and healthy water: 11 W UV-C clarifier for the quick and efficient elimination of greenish and whitish clouding in freshwater and marine aquariums. Inlet and outlet are positioned for practical use. Shortest installation length: 42 cm. Germ-killing UVC radiation, reduces risk of infection, no change to the water values, no effect on cleansing bacteria in the filter. TÜV tested, safety switch: automatically switches UV-C lamp off when device is opened. Sturdy, UV-resistant casing, 2-glass design