Water Filtration

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Across
  1. 3. What comes first, sedimentation or filtration ?
  2. 6. What comes after sedimentation ?
  3. 7. What is the last treatment in the water purification process?
Down
  1. 1. What is the first treatment in the water purification process?
  2. 2. Does disinfection disinfect the water ?
  3. 4. Does coagulation filter stuff ?
  4. 5. What is the last disinfectant ?