STR-SOLUTION is an unique air sterilizer with a patented technology where it volatilizes the natural sterilizer ions which emitted from the photocatalytic oxidation into the air in an indoor space of approximately 100 meter square or 250 meter cubic. It eliminates silently and sterilize safely the surroundings from viruses like SARS, MERS and Covid-19. It also banishes bacteria and fungus from the air and on the surfaces. STR-SOLUTION leads the market unlike other air purifiers or sterilizers where they vacuum and blow the new air after filtering or sterilizing in the device.