C Which water ​treatment ...

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Which water ​treatment ​disinfectant ​chemical ​disinfects all ​types pathogens ​in unsafe water?​  The ​water treatment ​chemical must ​not leave a ​harmful ​residual and ​should not take ​the treated ​water off WHO ​guideline ​parameters for ​safe drinking ​water. ​

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hlorination