Generally speaking, in China, this kind of question is not easy to answer. In addition to the shortage of scientific research and medical research, there is also an important factor, that is, public power, "authoritative institutions" and the media are more easily manipulated by interest groups. The problem of flour brightener shows that the Ministry of Health of Tang Tang is a small interest group whose total output value is less than 1 100 million, which can be easily solved, not to mention such a large market for drinking water. In this case, any authoritative expert is not necessarily reliable, and we can only discard the false and retain the true in the information revealed during the internal struggle of interest groups. For example, the water purifier group and the water purifier group each say how good their water is, and this information is certainly not credible; And when they accuse each other of doing something wrong, this information is of great reference value.
At present, the water that urban people drink is probably the above four kinds: tap water, bottled water or canned water, water filtered by water purifier, and water made of pure water. Among these four kinds of water, tap water in different places is different, and the water quality is very different. Moreover, it is tap water with good quality. Because of the economic cost to be considered in the treatment of waterworks, the organic and inorganic pollution of the intermediate pipes from waterworks to residents' homes, and finally the water flowing out of consumers' faucets has at least the problem of high chlorine content, and there may be problems such as inorganic particles, bacteria and viruses.
As for bottled water, excluding the fake and shoddy situation of tap water direct irrigation, the water quality may be very good, and the main problem is additives such as flour. The problem of additives was first exposed by reporters at the national drinking water conference a few years ago. The latest report says that there are 80 kinds of additives. What are the effects of these additives on human health? This problem is similar to how flour whitening agent affects human health. Experts who receive money from different sources argue with each other, while ordinary people seem to have to believe it.
Let's talk about the water purifier. Although experts and salesmen from different manufacturers say how different their products are, in today's high spirit of China shanzhai, in fact, everyone is similar. Generally speaking, the water purifier is nothing more than several stages of filtration: PP cotton, activated carbon and ultrafiltration membrane. PP cotton filters coarse suspended matter; Activated carbon mainly solves the problems of organic pollution and high chlorine, and the so-called post-activated carbon is to improve the taste; Ultrafiltration membrane is deep filtration. Water purifier manufacturers generally admit that the problem of water and alkali can not be completely solved, but claim that all minerals beneficial to human body have not been filtered out; The manufacturer of pure water machine retorted that the human body would never absorb beneficial elements from water, and the beneficial elements in a mouthful of food could not be compared with a large bucket of water.
As for water purifiers, they are actually the same low-tech profiteering products as they are now. The only high-tech component is the RO membrane invented and produced in the United States. The structure of water purifier is similar to that of water purifier, the only difference is that ultrafiltration membrane is replaced by RO membrane. RO is the abbreviation of reverse osmosis membrane in English, which means reverse osmosis or reverse osmosis in Chinese. The pore size of RO membrane is five millionths of that of hair. After filtration, it is basically pure water without adding anything else, so it is called pure water machine. Manufacturers who don't produce pure water machines say that pure water is unhealthy because there is nothing beneficial to human body. The reason behind this is, of course, because the person who said this does not produce or sell pure water machines. In fact, the problem of pure water is not a problem in theory or practice (Americans have been drinking pure water for decades). The real problem of the water purifier is that the filtration speed is too slow. Ordinary products can only produce 50 gallons (50GPD) a day, that is, less than 200 liters, so they can only be used for eating and drinking, not for bathing.
Finally, how a certain kind of water is beneficial to human health, not only the water itself, but also the human body. One of the characteristics of this animal is its strong ability to adapt to the environment. Sanlu's dispersion is very toxic, but as long as you eat a little bit step by step every day, you can gradually adapt. Therefore, it may take a long time to observe what water is bad for human health and what water is healthier for human beings. The key point is that this observation must avoid the interference of interest groups.
Qigong original