What chemical is typically adjusted to control pH in pool water?

Hydrochloric acid is commonly used to lower the pH level of pool water. Maintaining the proper pH balance is crucial for several reasons. A pH level that is too high can reduce the effectiveness of sanitation chemicals like chlorine and can lead to the formation of scale, cloudy water, and irritation to swimmers. When pH levels rise above the optimal range (typically between 7.4 and 7.6), using hydrochloric acid to bring the levels back down is a practical solution.

In contrast, sodium bicarbonate is primarily used to raise the alkalinity and buffer pH levels rather than directly adjust them downward. Calcium hypochlorite serves as a disinfectant and a source of chlorine; while it influences water chemistry, it is not primarily used for pH control. Algaecide is designed to eliminate algae growth and is not intended for adjusting pH levels. Understanding these distinct roles of various pool chemicals is essential for effective pool maintenance.