After effective chlorination of water free residual chlorine should not be less than
A. 0.5 mg/L
B. 1 mg/L
C. 50 mg/L
D. 200 mg/L
Answer:A
After effective chlorination of water free residual chlorine should not be less than
A. 0.5 mg/L B. 1 mg/L C. 50 mg/L D. 200 mg/L