What is a common effect of having high combined chlorine levels in pool water?

High combined chlorine levels in pool water are associated with reduced water clarity. Combined chlorine refers to chlorine that has reacted with contaminants in the water, such as organic matter and chloramines. When these contaminants are present in elevated amounts, they can create a cloudy or hazy appearance in the water, signaling that the chlorine is not effectively sanitizing the pool. This reduction in water clarity not only affects visual aesthetics but can also indicate poor water quality, which may lead to health risks for swimmers.

In contrast, while high combined chlorine levels can influence pH and oxidation potential, the primary and most noticeable effect is on water clarity. Therefore, maintaining a balanced chlorine level is essential to ensure the pool remains clean and safe for users.