May 9, 2013 Source: People's Daily

With attention to safe drinking water, more and more people choose to install home water purifier. Water purifiers use much, how effective? How to choose? Reporters in the market investigation, and interviewed experts.
market survey--
Water purifiers wide range of different functions, ranging in price from 30 yuan to 30,000 yuan
Reporters visited Beijing several large appliance stores and home market, found that the domestic water purifier manufacturers rarely stores. Beijing Fen Long Trading Company business manager Chen Zhu Jieshao, the current water purifier market is substantially EcoWater, Enics, 3M, AO Smith and other import brands control. "The difference between domestic and imported mainly in the filter of filtration precision and service life, the majority of reverse osmosis membrane water purifier manufacturers are used in the production of Dow."
A well-known home appliance sales staff told reporters, "the domestic and international water effects are basically the same, many international brand OEM also find our factory."
In Shanghai, the reporter visited the electronics store find, 3M, Philips, East Libi Nuo, Pentium, Patio brands readily available. "The high price of imported, generally have five or six thousand dollars, buy less. Sold more than eighty percent of the joint venture or domestic, customers are better able to accept the joint venture products, mostly priced at 2,000 yuan. The price of domestic brands slightly more, there are hundreds. "Shanghai an electronics store salesman Liusu Yuan said.
Reporters saw at Taobao, water purifier market price difference is huge, up to more than 30,000 yuan, the lowest less than 30 yuan. On the whole, low-cost sales of domestic water purifiers occupy the mainstream. According to reports, many of them are low-cost water purifier faucet mounted directly on the main filter water impurities, odor removal, etc., calcium and magnesium ions filtering effect in general.
Function Zeyang -
To remove impurities and improve taste, but also the removal of chemical contaminants
Wang recently home to worry about whether or not to install a water purifier. On the one hand I feel that they drink boiled water for decades also lacks the problem, on the other hand purifier function and not well understood. Have necessary to install a water purifier in the end?
For Pharaoh doubt, the Shanghai Water Purification Technology Association, honorary director Yueshun Lin said: "residents to install home water purifier reasons why there are two, one part of the district water pipe network longer useful life, the formation of a very thick wall deposition Tap water was 'secondary contamination'. Second, Shanghai skyscrapers, high-rise water tank, about 140,000, the property in the cleaning process may not be in place, so the residents would choose water purifiers. "
"The biggest feature is the water purifier cured flavor and remove impurities and improve taste. At the same time, to remove entrained water supply networks yellow rust." Yueshun Lin analysts say.
Associate Professor of Environmental Science and Engineering, Beijing Forestry University Yun Yan Bin said: "water disinfection generally adding chlorine, chlorine is easy to generate substances such as Prozac, therefore, the need to adopt measures such as water purification or boiling dechlorination."
Shanghai University professor of environmental engineering Xuguo Xun said, roughly, "drinking water health standards" for national standards purifier industry, "drinking water processor 2001 Health Assessment Protocol", etc. These standards specify the index ratio tap improve a lot.
Tongji Medical College, Huazhong University of Science and Technology, said Wu Zhigang, for example, the total number of bacteria, for example, reverse osmosis water purifier requirements 20CFU / ml, water requirements 100CFU / ml, we can see the water quality than tap water purifier.
How to choose -
According to water quality around to buy; some recommend using reverse osmosis water purifier, with a thousand or so some believe ultrafiltration water purifier on the line
Reporter survey found a wide variety of household water purifiers, water purifiers include faucet, countertop water purifier, wall-mounted water purifiers, water purifiers under cabinet, vertical water purifiers, net buckets. How to choose a consumer distress.
For the type of market in Sheung Shui purifier, Xu Guoxun considered to be divided into filter press technology, activated carbon adsorption, membrane technology, electrolysis technology, dissolution, mineralization, magnetic and other types, including membrane technology can be divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Among them, a larger aperture microfiltration technology, can only remove suspended solids; the equivalent of the minimum reverse osmosis membrane pore size, in theory, allow only water molecules to pass through.
Wu Zhigang introduction, comparative effect from water, ultrafiltration <NF <osmosis, reverse osmosis water is called pure water. Ultrafiltration and nanofiltration need to clear the activated carbon with chemical contaminants. Reverse osmosis is also activated carbon filter, but it is mainly a protective effect of reverse osmosis membranes, reverse osmosis membrane itself can remove chemical contaminants. Filtering accuracy nanofiltration is between ultrafiltration and reverse osmosis, the advantage is not only removes harmful substances, but also beneficial to human body mineral retention.
. "However, nanofiltration water purifier is expensive, the other two are more affordable," Wu Zhigang also suggested a very simple distinction between ultrafiltration and reverse osmosis, ultrafiltration water purifier without plug; reverse osmosis water purifier equipped with booster stick, we need to plug.
Yun Yan Bin, "a hundred dollars installed directly on the faucet, usually using a microfiltration membrane; five hundred dollars is usually multi-media filter; one thousand yuan or so many of the ultrafiltration membrane; prices again high, reverse osmosis membrane technology is basically used. "
Xu Guoxun said great harm to the body of carcinogens, such as pesticides, various aromatic hydrocarbons, such as benzopyrene. If you want to remove these substances, the general use of the reverse osmosis unit.
"To buy water purifier should be based on the actual situation and their own needs." Yueshun Lin believes that different water hardness in different regions, northern water calcium and magnesium ion content is high, easy to scale, should buy with an ion exchange resin cartridge water purification filter; and chlorine for water, heavier taste optional area activated carbon water purification more; for serious pollution, the need to drink directly home, optional reverse osmosis.
Yun Yan Bin said: "The average family will be able to use ultrafiltration to boil water after a simple filtering water can kill E. coli and other harmful microorganisms in the water most of the calcium and magnesium ions precipitate, better than the direct clean drinking water, and more. close to the natural water. "
During the interview, the sales staff and experts agree that the country is not the same quality, should be targeted to buy water purifiers.
Identification effect -
The average consumer is difficult to identify, professional bodies need specialized equipment; purification effect lack of uniform evaluation criteria, manufacturers often have the final say
"In the past water, bleach water has flavor, with a water purifier, there is no after taste will be better. Water effect in the end how not test." Wang home is Germany a certain brand of filtered water bottles, each filter changed every month.
Many manufacturers after its water can be drunk directly, as well as to reduce the scale after installing water purifiers to prove water quality has been purified. This statement accurate?
"In fact, the scale does not indicate how much water purification effect." Wu Zhigang, said the scale of calcium and magnesium salts related, are non-poison. Tsinghua University professor Liu Wenjun also said that high water hardness, refers to high calcium and magnesium ion content. Previously thought high hardness can cause stones, such as kidney stones, urinary tract stones. But modern medicine has proved that high hardness of the human body without harm, no calculus problems.
How to identify the effect of water purifier?
Wu Zhigang introduction, there are consumers called "Water Quality Index by special instruments to measure water purifier purified, before installing more than 200, after you install only a dozen," which refers to TDS pen instrument, which reflects the water trapped in the proportion of calcium and magnesium salts . "TDS pen can only detect the effect of the reverse osmosis water purifier, and other water purifiers no reference value. Accurate and comprehensive determination of water quality, need individual indicators of professional testing equipment."
How to determine the quality of water purifiers, Chen Huajie Shao Zhu said: "The time required to force water purification factory verification, through formal procedures factory water purifier is certainly in line with national standards, and now all the manufacturers of products in more than 80% to reach the international standards."
"Product effect how, in fact, are the final say by the manufacturer, not an evaluation criterion. Purifier can achieve the promised standard business user can not judge." Xu Guoxun that users can visually see with clear water quality turbidity, and fine particles can not be detected in the water and the existence of carcinogenic substances. "Standard lot, the management department are many, but the final bull management but is nobody."