What is Chlorination?​

Chlorination is a process which involves adding of chlorine to water but the chlorinating product which does not necessarily have to be pure chlorine

Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water. This method is used to kill bacteria, viruses and other microbes in water. In particular, chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery, and typhoid. 

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if you mean hydrogen and oxygen then water is the product