The new JBL ProCristal Compact UV-C water clarifier is a further development of the previous water clarifier from JBL. The new device is much more compact and therefore more space-saving in the installation. The total length is now only 27 cm. Like the previous version, the new JBL ProCristal Compact UV-C has the UV-resistant housing with glass bulb and reflector foil for more efficiency.JBL ProCristal Compact UV-C+ cristal-clear and healthy water: 5 W UV-C clarifier for the quick and efficient elimination of greenish and whitish clouding in freshwater and marine aquariums+ space-saving assembly: connect to external filter. Inlet and outlet are positioned for practical use. Shortest installation length: 32 cm+ germ-killing UVC radiation, reduces risk of infection, no change to the water values, no effect on cleansing bacteria in the filter+ German TV tested, safety switch: automatically switches UV-C lamp off when device is opened. Sturdy, UV-resistant casing, 2-glass design+ package