What is ultraviolet?
Ultraviolet light is part of the light spectrum, which is classified into
three wavelength ranges:
UV-C, from 100 nanometers (nm) to 280 nm
UV-B :from 280 nm to 315 nm
UV-A :from 315 nm to 400 nm

The Science of Ultraviolet Light
Light is electromagnetic radiation or radiant energy traveling in the form of waves. Ultraviolet (UV) energy is found in the electromagnetic spectrum between visible light and x-rays and can best be described as invisible radiation. The energy employed for UV water treatment is further categorized into two primary levels measured as wavelengths - 254nm and 185nm, where nm = 1/1000 of a micron. For disinfection and ozone destruction applications, the 254nm wavelength is utilized. For TOC reduction and chlorine destruction applications a unique wavelength is utilized. 

Advantages
The use of UV technology for water treatment has several inherent advantages. UV light does not add anything to the water stream such as undesirable color, odor, chemicals, or taste, nor does it generate harmful by-products. It only imparts energy to the water stream in the form of UV light to accomplish the process of disinfection, TOC reduction, ozone destruction or chlorine/chloramines destruction. UV disinfection produces no residual disinfectant to the finished water.