What is the recommended parameter for free chlorine residual in a pool?

The recommended parameter for free chlorine residual in a pool is generally established as 2 to 5 ppm (parts per million). This range is considered optimal for ensuring effective disinfection while maintaining swimmer comfort.

Chlorine is crucial for controlling harmful pathogens and maintaining water clarity, as it helps in the oxidation of organic materials and other contaminants. A free chlorine level within this range effectively reduces the risk of waterborne illnesses and ensures a safe swimming environment. Levels below 2 ppm may not adequately sanitize the water, allowing bacteria and algae to thrive, whereas levels above 5 ppm might lead to irritation of the eyes and skin for swimmers and can create an unpleasant chlorine smell.

Maintaining free chlorine levels within the 2 to 5 ppm range adheres to public health guidelines and contributes to optimal water quality in swimming pools, making it essential for pool operators to regularly test and adjust chlorine levels accordingly.