A few days ago, Miss Hu brushed her teeth early and found that there was a tiny red worm in the water flowing out of the faucet. “Our high-rise old residential areas use tower water tanks for water supply, and the water tanks are not cleaned in time. It is not surprising that there are red worms.†The neighbor advised her to quickly install a household water purifier.
Tap water needs to go through long-term municipal pipelines to be transported to thousands of households; high-rise households rely on secondary water supply, and sanitary management of public water tanks is inevitable, and these factors may cause safety hazards to our drinking water. Nowadays, citizens are paying more and more attention to the health of drinking water. In the face of water purifiers with various gimmicks, they have nothing to do but they are suitable for purchase. What kind of misunderstandings should consumers take out? To this end, the reporter asked relevant experts.
The functional concept is not as good as possible.
Miss Hu opened an online store and found more than 100 brands of more than 3,800 water purifiers. The price is less than 100 yuan, and the price is more than 40,000 yuan. A water purifier with a price of 699 yuan, claiming to have a high-energy permanent magnet magnetization composite filter, with activation, mineralization, weak alkalization, ionization, anti-oxidation, negative potential, antibacterial, detoxification and other functions. However, when Miss Hu consulted the product to realize the principle of these functions, the explanation of the merchant was not convincing.
Mr. Li bought a water purifier at a health product lecture. The manufacturer called the purified water of the product “high-energy activated water†and said that the water has dark spots, sun protection, and treatment of Hong Kong feet. Hypertension, oral diseases and other functions. After using it for a year after buying it, it has no effect on high blood pressure and oral diseases.
Ji Weigen, a water purification expert at the Changsha Home Appliances Chamber of Commerce, said that the main function of the water purifier is to remove harmful impurities from the water and make the drinking water safer and healthier. Other functions are the marketing gimmicks of the merchants, and consumers need not be too serious. The water purified by the water purifier is less likely to have health care functions. As early as 2005, the national health department issued a statement saying that wading products must not claim any health function.
Filtering levels are not as good as possible
Visiting some electric appliance stores and specialty stores in the city, the reporter found that many brands of water purifiers will use "multi-level filtration" as a selling point, and their prices will rise with the increase of the filtration level. Activated carbon, ceramics, resin, titanium rod, KDF, PP cotton, reverse osmosis membrane... A brand of water purifier up to 12 grades of filtration. “Is the more filtration grades, the better the purification effect?†In response to the reporter’s question, the brand promotion staff said: “That is certain, just like gauze, can the water filtered once and the water filtered ten times? ?"
“The filter element is the core technology of the water purifier. It is the key to determine the filtration effect. However, the more the filter stage of the water purifier filter, the better the filtering effect is.†Ji Weigen said that several levels of filtration means that there are several Filter elements, filter elements are available in different materials and types. If simple filter materials are used, the filtering effect of five or six filter elements is not as good as that of a high-performance filter.
Ji Weigen suggested that consumers should mainly look at these three filters when purchasing water purifiers: the first precision filtration, such as PP cotton, to block large particles such as rust, sand, and eggs in the water; Two activated carbon, remove organic matter, residual chlorine, odor, etc. in the water; the third main filter, generally using reverse osmosis membrane or ultrafiltration membrane, these two membranes have their own advantages, should be selected according to their own water quality. With these three filtration lines, there is nothing wrong with drinking water safety.
Filtering accuracy is not as high as possible
The higher the filter accuracy of the water purifier, the better. This is also a misunderstanding that is easy to occur when purchasing. “The higher the filtration accuracy, the purer the filtered water, but the more pure the drinking water is, the better.†According to the World Health Organization’s definition of healthy water, there is a standard that “the mineral content required by the human body is moderateâ€. .
At present, the core technology of mainstream water purifiers on the market is reverse osmosis technology and ultrafiltration membrane technology. The main difference is that the filtration accuracy is different. The reverse osmosis membrane is currently the finest membrane separation product, which can retain more than 0.0001 micron. After the source water is filtered, only water molecules remain, that is, we say pure water, minerals and trace elements beneficial to the human body. I was turned away. In general, rural well water with excessive heavy metals must use reverse osmosis water purifiers; in some parts of the north, the water quality is hard, and the reverse osmosis water purifier can also filter out calcium and magnesium ions in the water to reduce scale formation.
The ultrafiltration membrane has a pore size of about 0.01 micron, which can remove harmful substances such as sediment, rust, colloid, bacteria, macromolecular organic substances in the water, while retaining minerals and trace elements in the water. Drinking such water is more beneficial to the human body. Ji Weigen believes that tap water users in southern cities are more suitable for use with ultrafiltration water purifiers. Author: Peng Fang
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