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Who all need extra precaution from contaminated water?

contaminated extra precaution water
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Who all need extra precaution from contaminated water?

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Water hardness can be determined by how much soap is required to produce lather. It is caused by a variety of dissolved polyvalent metallic ions mainly Calcium and Magnesium cat-ions. Hardness can be categorized as temporary (Carbonate) and permanent (non-carbonate) hardness.

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