Health, 19.03.2020 05:45 dawsoncarlisle

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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During treatment of water to make it potable, about 90% of the microbes are removed A. by preliminar...

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