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 tested by TDS. For example, the TDS pen can also not detect the PH value, and the water quality is not in the [6.5-8.5] range, which does not meet the hygienic standard. In the CCTV "Is it Real" experiment, purified water with E. coli added is no longer safe to drink, but the TDS pen cannot 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 detector that can fully detect the above 30 items in 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 a portable device that can cost 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 the 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 value 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 related to the incidence of cardiovascular diseases, that is, the lower the hardness and pH of the drinking water, the higher the incidence. Long-term drinking of acidic water with pH<6.5 can cause osteoporosis, arteriosclerosis, diabetes, and acid reflux. From this aspect, PH value should arouse people's attention more than TDS, especially in acid rain areas such as the Yangtze River Delta and Pearl River Delta. In household life, the sources of drinking water are also different.
You can choose the water quality monitor that suits you according to your own needs and specific circumstances. If there is a need, you may wish to consider our water quality monitor, LH-TDS6 multi-parameter water quality tester: ergonomic design, small and portable, easy to operate, simple to measure, accurate results, precision surface package circuit to ensure compact The body has a variety of practical functions, built-in lithium battery, to meet the measurement needs of various places such as laboratories and on-site. It complies with the HJ/T399-2007 verification regulations and adopts the "Fast Sealed Catalytic Digestion Method (Including Photometric Method)" in the fourth edition of the "Guide to Water and Wastewater Analysis Methods". The measurement method is authoritative and the measurement result is legal. Find a right water quality monitor to manage your healthy home life digitally.