UV-O3 system has the strongest ability of sterilization and inactivated virus, which can effectively prevent the spread of infectious diseases. Experiment proof that inactivation of fecal Escherichia coli requires only 5 seconds, if want to achieve the same affection with the same concentration of chlorine required 15,000 seconds. Some of the pathogenic bacteria are resistant to chlorine, such as virus, Amoebae, Cysts etc. But all of them can be killed by OHˉ.

UV-O3 system has strong oxidizing ability. It can prevent the special odor compounds accumulated in swimming poor water, including Chlorinated organics what is reacted by chlorine with excretion, for example, monochloro amine, dichloramine, trichloramine, THM, chloriduria etc. Most of them are precursors of THM. But ozone can constantly prevent generation of precursors in swimming pool, to supply clear water, fresh air for swimmer, and without stimulation to their eyelids and nose strip.

UV-O3 system also can help sand filtration to removal of metallic salts and organics. Because the organics will easily become multi-polar compounds during oxidation process, and can combine with a number of multivalent metallic cations (eg. Ca, Mg, Fe, Al etc) into the complex compounds. And become micro-flocculate were removed by sand filtration last.