Is bottled water harmful or beneficial to human health?

Professor Zhu Huigang, head of the National Drinking Water Hygiene Group and Shanghai Medical University, stressed: "For drinking water, the purer the better. Inorganic elements in water exist in the form of dissolved ions, which are easily absorbed by human body. Therefore, drinking water is an important way for people to absorb minerals. Pure water contains almost no minerals. Previously, it was mainly used for boilers in thermal power plants, washing in electronics industry, integrated circuit boards and so on. Drinking pure water should be cautious, especially for children, the elderly and pregnant women. " The healthy drinking water proposed by the World Health Organization must meet six conditions, namely, no harmful substances, moderate minerals, moderate hardness, rich oxygen, small water mass and weak alkaline pH value. Pure water basically contains no minerals, its hardness is close to 0, its oxygen content is very low (distilled water is 0), its water cluster is large (> > 100Hz), and its pH value is around 6.0, so it is weakly acidic. The drinking water quality standards in Canada and Russia stipulate that the hardness should not be less than 50mg/L (calculated by CaCO3), and the standard hardness of drinking water quality in Europe and America should be kept above 60.