Features a quartz glass sleeve surrounded by a revolutionary "turbo- twist" flow design to increase dwell time, which in turn increases efficiency. Triple-treatment time fully utilizes all the available uv output of the lamp- out performs larger units. Treats up to 125 gallon freshwater or saltwater tanks. Hang-on bracket included or locate anywhere in your system. ( watt philips compact fluorescent uv lamp included. Eliminates single-cell algae for crystal-clear aquariums. Eradicates most harmful micro-organisms on the initial pass through chamber.