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So, let's search for various water quality testing instruments on the e-commerce platform, and you will find that the TDS water quality monitoring pen (meter) is the most sold. So, what is the TDS water quality monitoring pen? The TDS water quality monitoring pen, as its name suggests, is a pen-type detector that detects the content of TDS in water quality. TDS refers to the concentration of total dissolved substances in water, in milligrams per liter (mg), which mainly reflects the concentration of Ca2+ MG2+ Na+ K+ plasma in the water, and has a better corresponding relationship with the hardness and conductivity of water. The smaller the TDS value, The lower the concentration of Ca2+ MG2+ Na+ K+ plasma in water, the lower the conductivity. It can be said that the TDS must be low for water with good water quality; however, the argument that the lower the TDS is, the purer the water quality is not true.
This is because TDS only detects the conductivity of soluble substances in water, but it cannot detect the aforementioned microorganisms, sensory properties, radioactive indicators, etc. For example, pure water with added edible salt is still hygienic and drinkable water, but it is definitely an explosion if it is tested by TDS. For example, the TDS pen can also not detect the pH value, and the water quality does not meet the hygienic standard if the pH of the water is not in the range of [6.5-8.5]. In the CCTV 'Is it Real' experiment, purified water with E. coli added was no longer safe to drink, but the TDS pen could not detect it. TDS is only one of the parameters for detecting the quality of water. The value of TDS is not equal to the quality of water.
So, is there any consumer water quality tester that can fully detect the above 30 items on the market? No. One is cost restriction, and the other is unnecessary. First of all, if the above-mentioned test items are all completed, what is needed is definitely not portable equipment for hundreds of dollars; secondly, in actual residents' lives, most of the above-mentioned test items of drinking water meet the requirements. So, in the drinking process, besides TDS, are there other important items for testing water quality? The answer is PH value.
Let’s take a look at the international water quality standards. U.S. Environmental Protection Agency drinking water quality standards: Grade I water: No specific indicators. The pH of secondary water is 6.5-8.5. The EU drinking water quality standard is pH 6.5-9.5. For bottled or barreled purified water, the minimum pH should be reduced to 4-5. The Japanese drinking water quality standard stipulates that the pH value is 5.8-8.6. my country's GB5749 sanitary standard for drinking water stipulates a pH value of 6.5-8.5, and the GB17323 standard for bottled purified drinking water stipulates a pH value of 5.0-7.0. This is basically consistent with the standards of developed countries.
Why does healthy water need to have a pH between 6.5 and 8.5? From a large number of epidemiological research reports, it can be seen that the hardness of the water is negatively correlated with the incidence of cardiovascular diseases. That is to say, the lower the hardness and pH of the drinking water, the higher the incidence. Long-term drinking pH.
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