The contact time for disinfection by free chlorine is ______________ Options: A . &nbsp20 minutes B . &nbsp30 minutes C . &nbsp40 minutes D . &nbsp60minutes

The contact time for disinfection by free chlorine is _____________

Question

The contact time for disinfection by free chlorine is ______________

Options:

A . 20 minutes

B . 30 minutes

C . 40 minutes

D . 60minutes

Answer: Option A
Answer: (a).20 minutes

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