permanent hardness


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permanent hardness

n
(Chemistry) chem hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates
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References in periodicals archive ?
Permanent hardness is determined by titrating the boiled water instead of hard water and the same procedure of total hardness is followed.
Ordinary hardness can be removed just by boiling the water and then filtration to remove suspended particles, while permanent hardness cannot be removed unless proper treatment is given.
Hardness of water is due to the presence of Calcium Carbonate and Magnesium Sulphate in water that results in temporary and permanent hardness respectively.

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