Sterilization

Patent Pending PROBLEM TO BE SOLVED: To provide a sterilization method for demonstrating a high sterilization effect and making the high sterilization effect appear even at an extremely low residual chlorine concentration especially. ; SOLUTION: In the sterilization of infectious organisms in water utilizing facilities, the sterilization is carried out by making silver ions and copper ions, the silver ions and residual chlorine, the copper ions and the residual chlorine or the silver ions, the copper ions and the residual chlorine coexist.