VideRime Staff asked 5 years ago 
Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinking purpose?
a) Screening-> filtration-> sedimentation->disinfection
b) Screening->disinfection->sedimentation-> filtration
c) Screening-> sedimentation-> disinfection-> filtration
d) Screening-> sedimentation-> filtration-> disinfection
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