Drinking (potable) water treatment does not involve __________________?
Correct answer: D. Softening
- A. Coagulation
- B. Sedimentation
- C. Disinfection
- D. Softening
Explanation
Coagulation, sedimentation and disinfection are standard steps in conventional potable-water treatment. Softening is a specialised treatment used only when hardness reduction is required, so it is not universally involved.
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