MEDiSTICK Plus is a space-sterilizer, which sterilizes space with powerful chlorine dioxide gas that is harmless to human bod ... y. Chlorine dioxide has been used for sterilization and disinfection since 1960s, and it has been used to sterilize and disinfect drinking water, not only in Korea, but also in the United States, Europe and so on. WHO has defined the safety rating of chlorine dioxide same as that of salt, and NASA is using it for complete sterilization for space food. read more