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swimming pool
No.
To disinfect it.
Chlorine is used to disinfect Swimming Pools.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
Chlorine is not so much good for swimming but it is good for keeping the water free from harmful microorganisms, economically.
It is not sensible to mix bleach and chlorine, or any other cleaners, especially as the question appears to be about a swimming pool? It has been known that, potentially, the gas given off, when chemicals are haphazardly mixed can cause death! Always read the labels and use household cleaners and swimming pool chemicals - carefully.
Chlorine is used in swimming pools for a few reasons. The most common are: 1. Chlorine acts as a mild disinfectant, it makes swimming in the water a more sanitary activity. 2. Chlorine also inhibits the growth of algae. Without chlorine, most pools would be green within a few days.
chlorine
Swimming pools
No. In fact chlorine is added to swimming pools to kill bacteria.
No it does not have to be. It is just a measure of how usable the chlorine is.