Aquarium water UV-C sterilizer was designed for use with Fan 2, Fan 3, Versamax (FZN) and Minikani filters. Its integral part is a chamber containing a 3-watt light bulb emitting UV-C light that kills algae, protozoa and bacteria free floating in water depths. The chamber should be installed inside of one of the four modules enclosed with the kit, each of which corresponds to the relevant type of the filter. The water flowing through the Multi UV 3W chamber is both purified and cleared from the microorganisms dangerous for fish and regains full clarity. - Does not require any additional maintenance - UV lamp life of 8000 hours - Perfect for small and medium-sized aquarium tanks - Eliminates problems with water blooming - Prevents the growth of algae as well as fish diseases