... running water,sewage water ,dringking water and swimming pool water treatment and so on . CHYS-series Integrate ozone generator, tube mixer ... so on. "CHYS" means water ozone machine,"2" means water treatment capacity, and it can be adjusted from 2 to 3 ... so on, "CHYS" means water ozone machine, "2"means water treatment capacity(just like above)."C" means it will be equipped ...