... . But ozone can constantly prevent generation of precursors in swimming pool, to supply clear water, fresh air for swimmer, and without stimulation to ... can combine with a number of multivalent metallic cations (eg. Ca, Mg, Fe, Al etc) into the complex compounds. And become ... , but also can avoid risk of high ozone concentration in swimming pool (eg. >0.15 Mg/L). With using UV for small ...