What is the maximum allowable level of combined chlorine in swimming pools?

The maximum allowable level of combined chlorine in swimming pools is crucial for maintaining water quality and ensuring swimmer safety. The correct value is understood to be 0.2 ppm.

Combined chlorine refers to the chloramines formed when chlorine reacts with organic matter, such as sweat, urine, and other contaminants. Elevated levels of combined chlorine, especially above the 0.2 ppm threshold, can lead to several issues, including unpleasant odors, skin and eye irritation, and a reduced effectiveness of disinfection. Keeping the levels below this threshold helps to create a more pleasant swimming environment and ensures effective sanitation.

Other options suggest higher permissible levels, which are not aligned with current safety guidelines aimed at promoting swimmer health and water clarity. Maintaining combined chlorine levels at or below 0.2 ppm is essential for optimal pool management practices.