Water is the source of life. Without its nourishment, nothing can grow. In life, we have many misunderstandings about drinking water, such as not drinking impure water, fearing that repeatedly boiled water will cause cancer, and drinking water before going to bed will make our eyes swollen the next day ... These unfounded and long-standing obsessions not only disturb the normal concept of drinking water, but also affect our health. Pure water and tap water. Advantages of tap water: (1) Tap water is rich in minerals, trace elements and inorganic salts, which is very helpful for people to keep healthy. (2) Tap water is relatively low in price, widely used and in great demand, and can be used for rice washing, vegetable washing, bathing, laundry, tableware cleaning and sanitation. (3) Tap water has a better effect of promoting fluid production and quenching thirst. It can moisten the throat and make people fresh and comfortable. Very suitable for people with dry mouth, dry eyes, excessive thinking, lack of sleep and excessive speech. (4) The tap water tested and treated by the waterworks is relatively safe, disinfected and free from bacterial harm. 2. Advantages of pure water: (1) Pure water is oxygen-rich water with high solubility and the strongest affinity with human cells, which can promote metabolism. Proper drinking can activate cells and internal organs and enhance immunity and resistance. (2) Drinking pure water can eliminate the greasiness in human digestive system, eliminate blood lipids on blood vessels and lower cholesterol. It is good for patients with hypertension, arteriosclerosis and coronary heart disease. (3) Pure water can delay the absorption of ethanol, prevent diarrhea after drinking, and have the effect of relieving alcoholism. (4) Pure water contains no impurities and will not produce scale. So pure water is used in car water tanks, humidifiers, electric irons and so on. Will not scale, and the service life can be prolonged. Possible hazards of purified water and tap water 1. Possible hazards of tap water: There are many transmission channels of tap water. In each link, due to long time, disrepair of pipelines and untimely cleaning of water tanks, it is easy to cause water quality variation and affect water safety. Therefore, in some places with relatively poor management, some unfavorable indicators may exceed the national standards when tap water reaches users' homes. 2. Possible hazards of purified water: The main hazard of purified water is that minerals and trace elements beneficial to human body are filtered out in the process of filtration, so that purified water can not only supplement calcium, zinc and other elements, but also make some minerals already in the body absorbed by purified water and excreted. Therefore, long-term drinking will be harmful to human health. Correctly understand tap water and purified water 1. Correctly understand the problem that tap water contains harmful substances: Some people think that tap water contains a variety of chemicals such as dichloride, and drinking tap water for a long time will cause cancer. In fact, the main component of tap water is water, which contains almost negligible chloride ions and some trace minerals such as calcium ions, magnesium ions, potassium ions and sulfate ions. After the tap water is boiled, chemicals such as dichloride will evaporate with the steam, while most minerals such as magnesium ions, calcium ions, potassium ions and sulfate radicals will be converted into deposits (scale). Therefore, boiled tap water not only effectively kills bacteria, but also contains no chemicals harmful to human body, so it is safe and reliable drinking water. 2. Correctly understand the nutrient loss of purified water: Some people think that after purified water is filtered, minerals and trace elements beneficial to human body are filtered out, and drinking purified water for a long time will seriously damage health. In fact, minerals such as potassium, magnesium and calcium may decrease in the process of pure water filtration, but they will not all disappear. What is more noteworthy is that the mineral elements contained in natural water are very limited, or extremely trace, so it is difficult to ingest more mineral elements from water. So there is no difference between water and expensive water. Whether it is pure water or tap water, as long as the water quality is qualified (safe), there is little difference. As long as it is cooked properly, it will not cause harm to the body.