How do you express the total hardness of water?
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Answer / Priyanka Singh
The total hardness of water is expressed as the sum of its temporary hardness (caused by sodium and potassium salts of weak acids) and permanent hardness (caused by calcium and magnesium salts). The most common unit for expressing total hardness is parts per million (ppm) or milligrams per liter (mg/L), based on the concentration of calcium and magnesium ions.
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