Water purifier improves water quality and taste

Core tip: March 22 is the 24th World Water Day, and March 22-28 is the 29th China water week. At present, China implements the new version of "sanitary standard for drinking water"

This year, March 22 is the 24th "World Water Day", and March 22-28 is the 29th "China Water Week". At present, the new version of "sanitary standard for drinking water" is implemented in China, and the national compulsory standards for water quality of urban water supply have been increased from 35 items to 106 items. The standard on paper does not represent the actual detection ability, and the water quality standard of the water company does not mean that the tap water in the household can be directly drunk. How to make the family drink healthy and safe water? Ji weigen, a water purification expert of Changsha household appliance chamber of Commerce, suggests that it is better to use household water purifier.

Water quality standard does not mean residents' satisfaction

According to the "new national standard", the detection indicators of organic pollutants, pesticides, estrogens and other aspects of drinking water were added, which basically achieved the standard of drinking water in line with international standards. According to the principle, the conventional indicators are fully covered to meet the standard, ensuring the basic drinking water safety requirements. The most intuitive feeling of the people for the "new national standard" should be that the water color is clear and there is no peculiar smell in the water. But is that true?

Some citizens said that sometimes, especially in the dry season, when the tap is turned on, the water coming out is yellow, and the water tank of the toilet is often filled with yellow scale.

"Residents feel that there is a problem with the water quality, the main reason is the water supply link." Jiweigen said that tap water from water sources into thousands of households, through the raw water, water purification, water delivery, water use four links. The water supply company is responsible for the production of water. When the water is delivered to the residents' homes, it needs to go through a long urban pipe network. The users of high-rise buildings use secondary water supply, and also go through various facilities such as the reservoir and pump station in the community. This process can easily lead to water pollution to the residents' homes.

Water purifiers improve water quality and taste

How to avoid the secondary pollution of tap water? The survey shows that household water purifiers have entered more and more families.

Ms. Qin lives in an old house in the early 1990s. Due to the aging and rusting of the water pipes in the community, she bought the water purifier to filter out the rust and sediment in the tap water. After use, it is found that the filtered water not only becomes clear and transparent, but also tastes better. After boiling, the filtered water has no smell of bleaching powder, so it is better to make soup with filtered water.

Ji weigen said that the filter element of the water purifier mainly plays two roles: filtration and adsorption. Filtration is to intercept dirty things in tap water, such as rust, sediment, bacteria, etc.; adsorption is mainly aimed at chlorine in tap water, so the taste of water is naturally improved.

Purchase water purifier should check hygiene permission

In recent years, a variety of water purifiers have sprung up in the market. Some salesmen often tell consumers that the water filtered by their water purifiers has various health functions, and some even claim to be able to prevent and treat diseases.

The health supervision department reminds consumers that when purchasing water purifiers, they need not pay attention to the various concepts thrown out by the sales personnel, but should pay attention to check whether the purchased products have the hygiene approval document of products involving drinking water hygiene and safety issued by the health administrative department at or above the provincial level, and whether the products are attached with the product inspection qualification report of the same batch number.

Ultrafiltration membrane is recommended for tap water users

The reporter visited the water purifier market and found that many businesses regard the filter element as a selling point. The cleaner the filter is, the more consumers buy it.

Ji weigen told reporters that no matter what kind of publicity gimmicks are used by businesses, the water purifiers on the market are mainly divided into two core filtration technologies: ultrafiltration membrane and reverse osmosis membrane. Reverse osmosis membrane filtration has high precision, removing heavy metal ions and other impurities in the water, all nutrients in the water are filtered out, and the output is pure water, so the output rate is low. After a cup of tap water is filtered, only 1 / 3 cup of purified water is left, which is a big waste. The pore size of ultrafiltration membrane ranges from 0.001 to 0.02 μ m, which can remove impurities and retain minerals and trace elements in water.

"Water is an essential and important way for the human body to absorb minerals, and pure water cannot provide minerals for the human body. From a health point of view, the purer the drinking water is not the better. " Ji weigen suggested that rural families who dig wells for water but are worried about heavy metal and pesticide pollution can use reverse osmosis water purifiers; urban families using tap water should use ultrafiltration membrane water purifiers.