The technical code for disinfection of medical institutions requires that distilled water should be used for diluting when preparing disinfectant. This standard covers the disinfection of environment, equipment and other object surfaces, diagnosis and treatment equipment and appliances; the diluent of the hygienic requirements for disinfectants on the surface of ordinary objects is tap water, which is applicable to the disinfection of the surface of ordinary objects. It can be seen that there is no problem in diluting with tap water when it is used for disinfection of environmental substances and instruments that do not contact patients.

 

However, it should be diluted with distilled water for disinfection of respirator, anesthesia machine screw pipe and accessories, anesthesia mask, oxygen humidification bottle and other moderately dangerous articles. There are two main considerations: first, the tap water contains high concentration of inorganic impurities, including calcium and magnesium ions, sulfate ions, silicate ions, etc., which have an impact on the disinfection effect; second, the microbial pollution of tap water is unknown, whether it is directly supplied by the pipeline or the secondary water supply after storage in the water tank, it is possible to form a biofilm in the pipeline system or water storage tank, resulting in water quality change Poor. Therefore, due to the limitation of conditions, the risk of using tap water should be fully considered in the preparation of grass-roots hospitals.