Civil Engineering Mcqs

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

(A) 0.01 to 0.05 ppm

(B) 0.05 to 0.5 ppm

(C) 0.5 to 1.0 ppm

(D) 1.0 to 5.0 ppm

Submitted By: Ali Uppal

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