Different places have different water quality, so choose different water purifiers. And before purchasing, we should also have an understanding of the general situation of the water purifier.
At present, the water purifier has developed to the third generation. The first generation is a simple activated carbon or ceramic filter water purifier; the second generation is a water purifier using reverse osmosis membrane, ultrafiltration membrane, and nanofiltration membrane technology; The generation is a water purifier using nano-crystal technology.
The principle of the first-generation activated carbon water purifier is that activated carbon has abundant pores, which can effectively adsorb small molecular organics, residual chlorine, disinfection by-products and other harmful substances in the water. Activated carbon includes coal-based activated carbon and wooden activated carbon, while the water purifier uses coconut shell activated carbon. Although activated carbon has a good purification effect, it also has shortcomings. One is that it is fragile and low in strength, and it is easy to form new particles in the water; the other is that activated carbon mainly adsorbs organic matter and is ineffective against inorganic pollution; and the third is that the filtering effect is incomplete and it will cause secondary pollution. The second generation of water purifiers using reverse osmosis membrane technology mainly refers to water purifiers and most direct drinking machines using this technology. The third-generation nano-crystal water purifier is still in its infancy.
When purchasing, first choose different types of products according to the local water quality. If the tap water contains a lot of chlorine and organic matter, the color and odor are heavier, you should choose a water purifier with a larger amount of activated carbon; if the water quality is turbid, you should choose a water purifier with dual functions of coarse filtration and fine filtration. If the water pollution is serious, it is required to thoroughly filter out bacteria, viruses, different colors, peculiar smells, pesticides, heavy metals and other impurities in the water. You should choose a reverse osmosis membrane water purifier; if the water contains more calcium and magnesium ions, it is easy to condense. For dirt, you should choose a water purifier with an ion exchange resin filter element. In addition, according to the water source pressure or water consumption, you can determine whether you need to buy a water purifier with a pressure pump. Under normal circumstances, if the tap water pressure is between 0.15Mpa and 0.25Mpa, you can choose a water purifier without a booster pump. If the water consumption is large, it is better to choose a water purifier with a pressurized pump.