What can be used to sanitise water in swimming pools?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Bleaching powder.
Bleaching powder (calcium hypochlorite) is commonly used to sanitise water in swimming pools. It releases chlorine when dissolved in water, which acts as a powerful disinfectant, killing bacteria, viruses, algae, and other harmful microorganisms. This ensures that the pool water remains safe and hygienic for swimmers. Proper dosing is crucial to maintain effective disinfection while avoiding irritation to the skin and eyes.
Other options:
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Washing soda: Used mainly for cleaning and softening water, not disinfection.
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Dettol: A topical antiseptic, unsuitable for large-scale water sanitisation.
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Caustic soda: Used for pH adjustment or cleaning, not for killing microbes.