what is known as passing chlorine through gas through water to destroy germs?

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the process is known as chlorination and it is used in the sewage treatment plants to destroy germs and the last process before water is discharged in the water bodies.
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Water chlorination is the process of adding chlorine (Cl2) or hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic. In particular, chlorination is used to prevent the spread of waterborne diseases.
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