There is also a kind of drinking water that has been desalinated by seawater. All advanced countries have developed desalination plants, but because of the high treatment cost, most of them are only used in places lacking water sources. Tap water, as a part of indoor pipeline engineering, began to appear at the end of19th century and prevailed in the middle of 20th century.
Extended data
The current national standard for drinking water stipulates that the hardness of tap water should not exceed 450 mg/L; There is no standard value of water hardness based on health in the current drinking water standard of the World Health Organization. However, Zhao reminded that the development of infants' kidneys within 6 months is not complete, and water purification equipment can be considered to reduce the hardness of water quality.
Experts say that for ordinary families, boiling tap water is enough; It is suggested to use water purification equipment in heavily polluted areas or downstream rivers.
Wu Zhigang, a professor at Tongji Medical College of Huazhong University of Science and Technology, believes that ultrafiltration is not as good as reverse osmosis in terms of water purification effect. Zhao also said that people living in the lower reaches of rivers should use reverse osmosis water purifiers, which can filter out impurities, organic matter and pesticide residues more effectively.
Zhao especially reminded that ozone water machine should be used with caution, because ozone is a strong oxide, and drinking this water for a long time may cause damage to oral cavity and gastrointestinal mucosa.
China Economic Net-Expert: Functional water can cure diseases. Boiling tap water is healthy enough.
Baidu encyclopedia-tap water