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Question

According to WHO, the soft water has 0 to _____ milligram per litre as CaCO3.
  1. 60
  2. 180
  3. 120
  4. 150

A
60
B
180
C
120
D
150
Solution
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Concentration as CaCO3 Indication
0 to 60 mg/L Soft water
60 to 120 mg/L Moderately hard water
120 to 180 mg/L Hard water
>180 mg/L Very hard water
The following values are used to give an indication about water hardness.

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