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

The recommended level of free chlorine in swimming pool water is crucial for maintaining a safe and healthy swimming environment. A concentration of 1 to 5 parts per million (ppm) is considered ideal as it effectively sanitizes the water, killing pathogens and preventing the growth of algae without causing irritation to swimmers or affecting the water's clarity.

Maintaining free chlorine levels within this range ensures that the disinfectant remains effective while also balancing the water chemistry to enhance swimmer comfort and protect pool equipment. Levels lower than 1 ppm may not sufficiently inhibit harmful microorganisms, while levels above 5 ppm can lead to unpleasant swimming conditions and may require corrective actions. Thus, the choice reflecting 1 to 5 ppm aligns with best practices for pool sanitation and safety.