What is tap water? This is also used to ask? It is the water flowing out of the water pipes in our house, and the tap water that we spend to buy. However, everybody uses tap water every day, not necessarily knowing where the water comes from. The water intake of the waterworks varies from country to country. In principle, it is the nearest river, river, lake or reservoir and groundwater. After the water is introduced to the water plant, a series of purification treatments are started. In fact, China has quite strict requirements on the water quality of the waterworks. The “Life Reference Water Sanitation Standards†implemented in 2012 has been upgraded from the original 35 to 106, and some key indicators are related to the World Health Organization (WHO). The EU and US standards are comparable. The Health and Family Planning Commission requires: starting from 2015, all the 106 municipalities and provincial capital cities will have monthly inspection and monitoring of 42 of them at the prefecture and county level. The most important of them are turbidity, bacteria and chlorine. The content, etc., should be monitored daily or even in real time. According to such standards, China's tap water should be directly drinkable just like developed countries. However, the quality of water, in addition to the great differences in the country, even between different communities in the same city, the water quality is also good or bad. The reason for this is not that it is not carried out according to standards, but that even if everything is up to standard, many accidents may occur in the water pipeline. For example, the pollution of water pipes, such as the secondary water supply pollution of some high-rise buildings. Nowadays, many people live in high-rise buildings of dozens or dozens of floors. The water from the factory needs to be pressurized with water to reach thousands of households. Generally, in a bungalow or a building below ten floors, the faucet is directly unscrewed, and the water is sprayed out. For high-rise tenants living on more than a dozen floors or even higher levels, they need to have their own secondary water supply. There are two ways of secondary water supply. Some new buildings are used in the basement with variable-frequency high-pressure water pumps. At the same time, the water is supplied to the roof at all times. This method is relatively clean. Older houses are pumping water to the top of the building, building a reservoir on the roof, and supplying water under natural water pressure. The cleaning protection of many roof water tanks is carried out by the local property. The management level is uneven. Some of them do not clean all the year round. They accumulate a lot of mud and dirt. Some water tanks are not well closed. Some mosquitoes, red worms and others are entered. Dead mice, bacteria that have been destroyed at the factory, are breeding here again. The necessity of water purifier Therefore, there are more and more families buying water purifiers now, not because the water quality of the waterworks is not good, but because of problems such as water supply, water pipe transportation, secondary water supply and so on. Therefore, if you want your drinking water quality to be as good as possible, you need to have your own water again. There are several ways to filter water: the first is a stainless steel strainer with a minimum pore size of about 90 microns. The second type is PP cotton, which is very similar to the HEPA filter we talked about in the air purifier. It uses capillary fibers to absorb large particles and can retain more than 1 micron of impurities. The third type is activated carbon, which is also used in air purifiers. The pore size of activated carbon varies greatly, from 0.1 to several micrometers. It uses internal curved channels to retain particles, and has organic matter, odor, and pigment. Amazing. There are a variety of membranes, microfiltration membranes with a pore size of 1 to 0.1 micron or 100 nanometers, ultrafiltration membranes of 100 to 10 nanometers, and nanofiltration membranes with a very small pore size of 10 to 1 nanometer. The key question is, how do water molecules and some heavy metal ions are between 0.2 and 0.5 nanometers? How about separation? This involves a high-tech, reverse osmosis membrane that effectively filters out pure water and leaves other ions. All the water purifiers on the market are basically different combinations of the above several filtering methods. Commercial mainstream water purifier analysis The first is the Biereng water bottle that is selling very hot on the market. It has been welcomed by many people at a relatively low price. The legendary effect of this kind of filter kettle is more god-like, and the filter is clear and sweet, and the baby drinking water depends on it. In the introduction of the website, “the imported filter element from Germany†is said to be effective in filtering impurities, scale, chlorine and heavy metals. At this time, everyone should use the knowledge introduced above, look at its page introduction, the filter is first a small pore filter, the size of the pores is small, the kettle is filtered by the weight of the water, the water pressure is not large, still The water can be discharged at such a fast speed that the pore size is not too small, it should be around 1 micron, and some visible impurities should be filtered out. The second one should be natural activated carbon. Many people said that the package that just opened the filter will see some black powder outside the filter, which is actually some particles of activated carbon. At the beginning of use, the water is black, that is, the activated carbon leaks, just wash a few more. This is also the reason why the instructions in the manual indicate that the first two filtered waters are to be dumped. Activated carbon is a way to effectively remove residual chlorine. However, it is not possible to filter out the positively small calcium carbonate and magnesium carbonate of the molecular body by the filter and the activated carbon, so there should be scale in the filtered. But this time it was found to have a third level, not a filter, but an ion exchange. There is an ion exchange resin with a functional group that can replace its own hydrogen with calcium and magnesium in the form of inorganic salts in water to soften water. Then there is a simple filter attached to the faucet. For example, the simple filter of the faucet of Jiuyang is very convenient to install. You can choose to directly discharge the raw water, and switch to the filtering mode. The introduction says it has built-in 304 stainless steel mesh, PP cotton, activated carbon and ceramic filter cartridges with a filtration rating of 0.1 micron. From the perspective of volume, the effective filtering area is small, the capacity is limited, and the filter element needs to be changed frequently. Then there is a large water purifier such as the 3M water purifier main model. Generally, this water purifier has two filter elements, the front is PP cotton, and the main filter part is PP cotton plus activated carbon. From the point of view of the filter material and the 0.2 micron filter accuracy, there is nothing new. There is also a double-filter water purifier for ultrafiltration and reverse osmosis, such as the water-saving household water purifier in the garden. The ultrafiltration mode water path is first through PP cotton, then activated carbon, and finally through a membrane with a pore size of 0.01 micron ultrafiltration, the water output speed is relatively fast. The reverse osmosis mode does not pass through the ultrafiltration membrane. After PP cotton and activated carbon, it is transferred to the RO reverse osmosis membrane and stored in a water storage tank. Because the reverse osmosis method has high filtration precision, slow water filtration and small water volume, if a sudden large amount of water can not be filtered immediately, the filtered water will be stored in a bucket first. Note that this bucket must be vacuum sealed, and the bacteria will be white filtered. At the end of each time, water is passed through a layer of activated carbon. This is because if the water is left in the bucket for a long time, there will be a plastic smell. The activated carbon can effectively taste and improve the taste. Finally, the kitchen water purifier. For example, Xiaomi's kitchen-type water purifier has only one mode of reverse osmosis. The waterway is almost the same as the garden, first passing PP cotton, activated carbon, and then reverse osmosis membrane. Note that it does not have a water storage tank, but instead flows directly through the activated carbon. Therefore, the effluent efficiency is slightly slower than that of the ultrafiltration plus reverse osmosis double-stage water filter. In addition, Xiaomi's biggest selling point is the use of RO membrane, and this faucet with TDS monitoring. When the TDS exceeds a certain value, the blue light becomes orange. It is very useful. If there is sudden water pollution, you can remind you not to use water for a while. After reading the introduction, you do not need a water purifier, or the best way to drink water, you have to analyze according to the actual environment. If you are in a new residential area in a first-tier city, it is not necessary to consider the water purifier from safety. If you use it, it is more comfortable for drinking water. In old communities, remote cities, especially those living in high-rise water tanks for secondary water supply, the role of water purifiers is very obvious. The family water filtration is either a cheap solution: filter it with a filter kettle and boil it before drinking. Of course, remember to change the filter. Or just buy a water dispenser with RO reverse osmosis membrane and filter it and drink it. In short, it is best for everyone to master the new skills based on the principles of today's theory, and choose the right water purification solution for your home. Source: Tonight's Economic Weekly reporter Liu Chang [Scan the QR code below, pay attention to the WeChat public number "Jiuzheng cabinet network "; you can view the popular article " 2017, cabinet people must be booming " , want to communicate with peers can join the Jiuzheng building materials network cabinet exchange group] Led Linear Light,Led Linear Strip,Led Linear Pendant Light,Recessed Linear Light JIANGMEN MICHEN LIGHTING CO.,LTD , https://www.jmledbulb.com
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