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Social & Preventive Medicine
Hardness of water is expressed per litre (m Eq/L), one unit which is equivalent to which one of the following.
20 mg CaCO3 (20 ppm)
30 mg CaCO3 (30 ppm)
40 mg CaCO3 (40 ppm)
50 mg CaCO3 (50 ppm)
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