Softening is recommended when hardness of water is more than:
Correct Answer: 150mg/litre
Description: Softening is recommended when hardness of water is more than 150 mg/L (> 3mEq/ L). Softening of water is done by Temporary hardness Permanent hardness Boiling Lime NaCo3 Permutit NaC03 Base exchange
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Social & Preventive Medicine
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