Our Helix Max 18W UV Sterilizer for fresh and saltwater aquariums. It eliminates single cell algae for crystal clear water in aquariums and ponds. The water is directed in a spiral path around the quartz tube resulting in more efficient use of the UV radiation than in standard units. The inlet and outlet fittings can be rotated by 360 degree for easy mounting at any angle. It comes with a 32 foot cable and high frequency electronic ballast, which increases the lifetime and the efficiency of the UV bulb.