chlorination -
The act or process of chlorinating something; especially, the addition of chlorine to water to purify it, and a process for the extraction of gold by exposure of the auriferous material to chlorine gas.
Wikipedia
Chlorination is the process of adding the element chlorine to water as a method of water purification to make it fit for human consumption as drinking water. Water which has been treated with chlorine is effective in preventing the spread of waterborne disease. The chlorination of public drinking supplies was originally met with resistance, as people were concerned about the health effects of the practice.
OmegaWiki Dictionary
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chlorination The application of chlorine to water, sewage or industrial wastes for disinfection or other biological or chemical purposes.\n(Source: ALL)