Yes. Because it is hot.
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The threat of having a unsanitary hot tub is always there since it is a warm and moist environment. Hot tubs and whirlpool baths can provide a fertile breeding ground for a number of bacteria that cause infection or disease. You can prevent illness from hot tub use by learning about and maintaining safe water quality in your hot tub. It is the owner's responsibility to ensure the hot tub is clean and the water is properly disinfected to prevent the spread of germs and disease.
To periodically remove any stubborn microorganisms, or in the event of poor water sanitation, "shocking" the hot tub is recommended. This can be done with either potassium monopersulfate or a relatively large dose of granulated chlorine. The hot tub should not be used for a period of time after starting the shock treatment, typically 15 minutes for potassium monopersulfate and 8 hours for chlorine.
Hot tubs can be dangerous to the health under some circumstances. Studies show that usage may increase miscarriage risk in pregna