railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Water Treatment

As per IS 10500 : 2012, in drinking water, the permissible limits of Total hardness (as CaCO3) in the absence of alternate source is:

1
600 mg/I
2
1000 mg/I
3
40 mg/I
4
200 mg/I
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