2. The higher the 2.tds value, the more impurities contained in the water. Impurities usually refer to the concentrations of calcium ions, magnesium ions, sodium ions and potassium ions in water, and cannot directly indicate the quality of water. Therefore, a high tds (above 600) does mean that the water quality is not good, but a low tds does not mean that the water quality is good.
TDS:
Total dissolved solids, also known as total dissolved solids, are expressed in milligrams per liter (mg/L), indicating how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances are contained in the water. Total dissolved solids refers to the total amount of all solutes in water, including the contents of inorganic substances and organic substances. Generally speaking, the salt in the solution can be known by its electrical conductivity. Generally speaking, the higher the conductivity, the higher the salt content and the higher the TDS. Among inorganic substances, there may be molecular inorganic substances besides ionic components. Because the organic matter and molecular inorganic matter contained in natural water can generally be ignored, the salt content is generally called total dissolved solids. However, TDS can not effectively reflect the water quality of a specific water body. For example, electrolytic water, due to the obvious increase of charged ions such as [OH]- in electrolytic water, the corresponding conductivity is abnormally increased. For example, the TDS value of alkaline water obtained from pure water with original TDS of 17 is about 300.