What is the correct range for free chlorine in pool water?

The correct range for free chlorine in pool water is between 1 to 3 parts per million (ppm) because this level effectively maintains water sanitation while being safe for bathers. Free chlorine is a vital component in pool sanitation, as it is the active form that disinfects and kills harmful pathogens and bacteria in the water. Keeping the free chlorine levels within this optimal range ensures that the water is both clean and comfortable for swimming.

Lower levels, such as 0.5 to 1.0 ppm, may not provide adequate disinfection, risking health issues due to insufficient pathogen control. On the other hand, higher levels, such as 4 to 6 ppm or above, can lead to discomfort for swimmers, including skin and eye irritation, and may also impact water balance and overall swimming pool chemistry. Therefore, maintaining free chlorine in the 1 to 3 ppm range strikes the right balance between effective sanitation and swimmer comfort.