Ultraviolet treatment disenfects the water by ısing 254 nm wavelenght UV-C waves. When these waves hits the micro-organisms, the harm their DNA by using “Photo-axidasion=advanced Uv treatment.”The UV treatment equipments are using the UV lights which use the 254 nm wavelength, which kills the micro organisms in the water. When choosing the UV equipment, it is very important to consider the water’s phsical, chemical and micro-biological quailites and the flow rate.