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Pick out the true statement pertaining to water treatment. | |
A. | Slow sand filters can remove colour completely. [Wrong Answer] |
B. | Activated carbon can be used for taste & odour control without subsequent filtration. [Wrong Answer] |
C. | Application of activated carbon reduces the temporary hardness of water. [Wrong Answer] |
D. | Normally, the turbidity is removed by adding a coagulent prior to sedimentation. [Correct Answer] |