Xiao Qiang poured the turbid river into the beaker. First, add alum to mix and dissolve it, calm it for a while, and then filter it. (1) add alum? (1) alum can absorb suspended matter in water,(2) when filtering,(3) the filtered water still contains some water-soluble substances,It is not pure water. Therefore, it is not pure water;
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The average filter is only more than one hundred yuan. why should your products be so expensive? Who can talk? This product is a high-tech product. It is studied through countless efforts, time and money by many scientists in the United States, and is not comparable to the general filter. In 1960s, the United States spent about $0.5 billion to solve the problem of astronauts drinking water on the moon, so pure water was also called Space water in the United States. Its function has been proved to discharge pesticides, bacteria, heavy metals and impurities well and keep good water molecules, and the bad water molecules are separated. In addition, seawater desalination and medical treatment are also handled by the principle of reverse infiltration. Although the general filter is cheaper, whether it can really filter out the harmful substances in the water is the most important. if you can't change the water quality just because you buy cheap goods, it really costs money and can't make the best use of it, there