The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about?

0.01 to 0.05 ppm
0.05 to 0.5 ppm
0.5 to 1.0 ppm
1.0 to 5.0 ppm

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Answer: Option 2

4 views Answered 2022-09-01 13:21

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