The UV sterilizer Aqua Medic Helix Max 2.0 clears the water with the help of ultraviolet radiation. This radiation is emitted by a special lamp in the unit. The UV-C radiation kills all forms of life that are directly exposed to the radiation - single cell algaes, bacteria, protozoa and other parasites, provided the dose is sufficient. The result is crystal clear water and healthy fish. The irradiance depends on the flow rate through the UV system. Spiral-shaped, removable water flow: The unique water flow and the large volume of the Helix Max units ensure optimal water clarification. 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 inserted, exchangeable spiral tube also reduces the risk of UV damage to the outer housing, especially in the absence of water flow.Aqua Medic Helix Max 2.0 -UV-C Sterilizer-+ eliminates single cell algaes giving crystal clear water in salt and fresh water aquaria+