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What are the causes for Permanent har...

What are the causes for
Permanent hardness

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Temporary hardness of water is casued due to the presence of bicarbonates of calcium and magnesium, i.e., `Ca(HCO_(3))_(2)` and `Mg(HCO_(3))_(2)`, while permeanent hardnessof water is due to the presence of soluble chlorides and sulphates of calcuim and magnesium, i.e., `CaCl_(2)MgCL_(2)`,`CaSO_(4)` and `MgSO_(4)`.
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