eceidyrb9533 eceidyrb9533
  • 19-03-2020
  • Health
contestada

During treatment of water to make it potable, about 90% of the microbes are removed A. by preliminary fermentation. B. in the sedimentation step. C. by treatment with alum. D. by treatment with chlorine or ozone. E. in the filtration step.

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debragrisby59 debragrisby59
  • 19-03-2020

Answer:e

Explanation:

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