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Final answer:

The correct order of water purification steps is coagulation, sedimentation, filtration, and disinfection.


Explanation:

The correct order of water purification steps is as follows:

  1. Coagulation: Chemicals are added to untreated water to clump solids together.
  2. Sedimentation: The water is moved to tanks where clumped solids sink to the bottom.
  3. Filtration: Water is passed through filters to remove smaller particles.
  4. Disinfection: Chlorine is added to kill bacteria and microbes.

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