The duration of contact of chlorine with water before it is served to – McqOptions

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1.	The duration of contact of chlorine with water before it is served to the first consumer, should be at least
A.	10 to 15 minutes
B.	15 to 20 minutes
C.	20 to 30 minutes
D.	30 to 40 minutes
Answer» D. 30 to 40 minutes

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