Chlorine is very effective at killing germs if it’s kept at the right levels, and if the pH of the pool at kept at the proper level for the disinfectant to work.
In 2013, for example, the CDC said 20 percent of inspections of public hot tubs and spas showed they did not have enough disinfectant..
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A hard-to-kill germ called Cryptosporidium can resist the chlorine disinfectant in swimming pools and is a leading cause of outbreaks linked to pools, federal health officials said Thursday.
Hotel swimming pools and hot tubs can be a major source of these outbreaks, the Centers for Disease control and Prevention said..
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