What detrimental effect does high pH have on chlorine?

High pH levels in pool water can significantly reduce the effectiveness of chlorine as a disinfectant. Chlorine operates optimally within a specific pH range, typically between 7.2 and 7.6. When the pH rises above this range, the proportion of free chlorine available to kill harmful pathogens decreases. This is primarily due to the formation of chloramines, which are less effective in sanitizing compared to free available chlorine.

As the pH increases, the ability of chlorine to break down organic contaminants and bacteria diminishes, leading to a less safe swimming environment. This highlights the importance of maintaining balanced water chemistry in order to ensure that chlorine remains an effective sanitizer. Proper monitoring and adjustment of pH levels are essential for maintaining pool hygiene and safety.