Chlorine is used as a disinfectant to kill bacteria, algae, germs in the swimming pool water so that it is safe for swimming. Along with other chemicals, it works to keep the walls and bottom of the swimming pool clean.
Chlorine is added in a swimming pool in the form of chemicals as calcium/sodium hypochlorite. These chemicals are known as "antimicrobial pesticides." The calcium and sodium hypochlorite used in pools decomposes into Chlorine and Calcium/ sodium hydroxide. They are available as tablets, granules and sometimes as a liquid in the market.
2 NaOCl + H2O = 2 NaOH +Cl2
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