Permanent hardness of water due to sulphates of the metal, can be destroyed by the use of
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- Permanent hardness of water due to the presence of metal sulphates can be removed by the use of ____.
- Permanent hardness of water can be removed by using
- Permanent hardness of water can be removed by _____________.
- Permanent hardness of water is due to presence of _____.
- Permanent hardness of water may be removed by the addition of
- Temporary hardness of water is due to the presence of _____.
- Temporary hardness of water is due to the presence of
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