Cristal-clear and healthy water: 11 W UV-C clarifier for the quick and efficient elimination of greenish and whitish cloudiness in freshwater and marine aquariums. Space-saving assembly: connect to external filter. Inlet and outlet are positioned for practical use. Shortest installation length: 42 cm. Partial sterilisation for aquariums up to 800 litres (pump max. 500 l/h), to combat floating algae up to 200 l in the aquarium (pump max. 500 l/h). Partial sterilisation reduces the risk of disease. Floating algae turn the water green. T tested, safety switch: UV-C bulb switches off automatically when the device is opened. Sturdy, UV-resistant casing, 2- glass-cylinder design. Package contents: complete UV-C device, 2 m cable, UV-C bulb 11 W, socket: G23, wall mount, screws, nozzle hose connections for 16-19 mm hoses. Guarantee: 2 years (+2 years upon registration of the product).