The correct sequence of processes in a water t reatment plant for rural water apply is

- 1
  
  Chlorination, aeration, sedimentation, rapid sand filter
- 2
  
  Coagulation, sedimentation, slow sand filter, chlorination
- 3
  
  Coagulation, flocculation, clarification, pressure filter
- 4
  
  Aeration, plan sedimentation, slow sand filter, chlorination

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