What level of combined chlorine indicates that the pool water quality is poor?

A combined chlorine level above 1.0 ppm is an indication of poor pool water quality. Combined chlorine, which consists of chloramines formed when chlorine reacts with organic materials such as sweat, urine, and skin, should ideally be kept low to ensure safe and pleasant swimming conditions. Levels exceeding 1.0 ppm suggest that there is a significant presence of these chloramines, which can lead to unpleasant odors, skin irritation, and eye discomfort for swimmers. This elevated level means the water is not being properly sanitized, and it may require shock treatment to bring the combined chlorine down to a more acceptable range, ensuring the health and safety of pool users.