What is the acceptable level of free chlorine in swimming pool water?

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The acceptable level of free chlorine in swimming pool water is critically important for ensuring both safety and sanitation. The correct range typically recognized by health and safety guidelines is 1 to 3 parts per million (ppm) for residential pools, and up to 5 ppm for public or commercial pools, depending on usage and load.

The range of 2 to 20 parts per million (ppm) can be misleading as higher levels of chlorine can lead to irritation of the eyes and skin, as well as potential damage to pool surfaces and equipment. Free chlorine within the range of 1 to 3 ppm is effective for disinfection while minimizing discomfort for swimmers.

While some pools may temporarily require higher levels of chlorine for shock treatments or specific circumstances, these conditions are not ideal for regular pool operation. Maintaining free chlorine levels between 1 to 3 ppm addresses both sanitation needs and swimmer comfort, making the initially provided range the most acceptable for general use.

In summary, while there may be occasions that necessitate higher chlorine levels, such practices should be closely monitored and returned to safe levels promptly to provide a healthy swimming environment.

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