Water is the most important of the six nutrients for human survival, and minerals and trace elements in water are very important to human health. Professor Jin from the Center for Life Dynamics and Water Resources Research of Beijing Institute of Hard Chemical Industry pointed out: "Water plays a very important role in the origin and continuation of life. In this sense, it cannot be said that water is used to quench thirst. The far-reaching significance of water lies in maintaining human health and prolonging life. " When choosing drinking water, people should pay more attention to whether it is beneficial to health and whether pure water is beneficial to health. Dr Chai Weizhong, from the Center for Public Nutrition and Development of the National Development and Reform Commission, emphasized in the "2005 China Drinking Water Industry Forum" that "pure water has a strong ability to dissolve minerals and trace elements. After people drink a lot of pure water, the original trace elements, nutrients and nutrients in the body will quickly dissolve in pure water and then be excreted, which will make the nutrients in the human body out of balance, leading to health deficit, which is not conducive to health. Nowadays, many countries in Europe stipulate that pure water cannot be directly used as drinking water. " Martin Fox, MD, a famous American water expert, emphasized in the book Healthy Water: "Drinking polluted water and desalinated water (purified water) will do harm to our health." Ding Nanhu, a researcher from the Water Supply Department of China Naval Medical Research Institute, conducted experiments on mice for seven years from 1987 to 1994, and let them drink distilled water for a long time. The results showed that the mice grew slowly, lost weight, suffered from osteoporosis, muscular atrophy, and the functions of pituitary and renal gland system were destroyed. The garrison on an island in Dalian used to drink homemade distilled water (pure water). For a long time, officers and men suffered from various diseases lacking minerals. Chen Mengxiong, a senior academician of Chinese Academy of Sciences, said: "Drinking purified water for a long time will reduce the intake of minerals and beneficial elements.