What is the maximum safe level of combined chlorine in pool water?

The maximum safe level of combined chlorine in pool water is 0.2 ppm. Combined chlorine, which is the result of chlorine reacting with organic matter, can lead to various issues in pool water quality, including irritation of the eyes and skin for swimmers, as well as a diminished efficacy of chlorine as a sanitizer.

At levels above 0.2 ppm, the problems associated with combined chlorine can become more pronounced, making swimming uncomfortable and possibly unsafe for bathers. Thus, maintaining combined chlorine levels below this threshold is vital for ensuring a safe and enjoyable swimming environment. This standard helps pool operators to manage water quality effectively, contributing to the overall health and safety of pool users.