Which among the following methods can be used to remove the permanent hardness in water due to calcium or magnesium sulphates?

Which among the following methods can be used to remove the permanent

1.	Which among the following methods can be used to remove the permanent hardness in water due to calcium or magnesium sulphates?
A.	Sulphonate method
B.	Nitrate method
C.	Zeolite method
D.	None of the above
Answer» D. None of the above

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Which among the following methods can be used to remove the permanent hardness in water due to calcium or magnesium sulphates?

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