Dirty water contains germs and can be harmful. Swimming pools are disinfected by bubbling through water a controlled amount of:

air

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oxygen

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bromine

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chlorine

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Solution

The correct option is D chlorine
As a halogen, chlorine is a highly efficient disinfectant and is added to dirty water as chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules. The amount of sodium hypochlorite (source of chlorine) required for water treatment is 0.2-2 mg of $N a O C l / L$ of water being recommended.

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