Question

The concentration of hypochlorite used should provide atleast
a. 0.1 ppm of residual chlorine
b. 0.5 ppm of residual chlorine
c. 1 ppm of residual chlorine
d. 0.01 ppm of residual chlorine

Answer 1

0.5 ppm of residual chlorine

Answer 2

The concentration of hypochlorite used should be provided at least 0.5ppm of residual chlorine but they are typically used at 0.02- 0.2% levels of available chlorine .