Calcium hardness is a measure of the amount of calcium ions present in the water.
A description of water as “hard” means that it has a high mineral content. These minerals are largely made up of calcium and magnesium carbonates, bicarbonates, chlorides or sulfates. The minerals get into the water mostly through washing over or through limestone and chalk rocks.
Total hardness of water consists of magnesium hardness and calcium hardness.
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