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HELp asap? I need some help?

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How is Water Treated to protect us from E-coli? Explain!!!

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  1. Reverse Osmosis, Ozonisation , Chlorination and Ultra Violet radiation are the processes mainly used to remove E Coli.


  2. Most ground water is free from e-coli. surface water is treated with chlorine or UV lights to kill off most living things.

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