Which of the following is a common sign of improper pH levels in pool water?

Improper pH levels in pool water can lead to a variety of issues, with skin irritation and cloudy water being among the most common signs. When the pH levels are either too high or too low, it can significantly affect the comfort of swimmers. Low pH (acidic water) can cause skin and eye irritation, making it uncomfortable for swimmers, while high pH (alkaline water) can lead to cloudy water due to the formation of scale and the reduction in the effectiveness of chlorine as a sanitizer.

In contrast, clear water does not indicate an issue with pH levels, as it can occur even with improper pH, provided other water quality factors are balanced. A strong chlorine smell often mistaken for a sign of high chlorine levels, is more an indication of chloramines, which form when chlorine reacts with contaminants, rather than direct evidence of pH imbalance. High water temperature does not directly relate to pH levels, although it may affect chemical reactions in the water. Therefore, the presence of skin irritation or cloudy water serves as a clear indication that pH levels must be assessed and corrected to restore pool water balance and swimmer comfort.