After cleaning the slow sand filter, the filtered water should not be used for a period of -
(a) upto 6 hours
(b) 6 hours to 12 hours
(c) 12 hours to 24 hours
(d) 24 hours to 48 hours.
The correct Answer Is
(d) 24 hours to 48 hours
(a) upto 6 hours
(b) 6 hours to 12 hours
(c) 12 hours to 24 hours
(d) 24 hours to 48 hours.
The correct Answer Is
(d) 24 hours to 48 hours
