Question

What are the different units used to express hardness of water

Answer 1

Water hardness is unfortunately, expressed in several different units and it is often necessary to convert from one unit to another when making calculations. Most commonly used units include grains per gallon (gpg), parts per million (ppm), and milligrams per liter (mg/L).

Answer 2

The units used to express the hardness of water $mol/L$ or $mmol/L.$

What is the hardness of water?

• The amount of dissolved calcium and magnesium in the water is referred to as water hardness.
• Hard water contains a high concentration of dissolved minerals, primarily calcium and magnesium.

Units used to express the hardness of water:

• Drinking water should have a hardness of between $80$ and $100 mg/L$.
• $gpg, ppm, mg/L$ are the most commonly used units in the hardness of the water.

Hence, the units of measurement for water hardness are $mg/L$.

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