Chlorine is an important part of water treatment. It kills disease-causing bacteria, and some chlorine persists in the water and prevents reinfection further down the line.
Chlorine prevents the growth of algae, eliminating bad tastes and smells, and removes discolouration caused by organic compounds.
However, there are risks from using chlorine to treat water. Chlorine gas is very harmful if breathed in - it irritates the respiratory system. Liquid chlorine on the skin or eyes causes severe chemical burns.
Chlorine also reacts with the variety of organic compounds that water contains to form chlorinated hydrocarbons, of which many are carcenogenic,
However, this increased cancer risk is small compared to the risks from untreated water - a cholera epidemic could kill thousands of people.
There are ethical considerations too. We don't get a choice about having our water chlorinated - some people object to this as forced 'mass medication'.
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