The function of hydrochloric acid, commonly sold in diluted form for swimming pool use, is primarily to lower the pH and total alkalinity of the water. An elevated pH can lead to scale formation, cloudy water, and reduced sanitizer effectiveness. Similarly, high alkalinity can cause pH instability, making it difficult to maintain the correct balance. Introduction of the acid effectively neutralizes alkaline compounds, shifting the water chemistry toward the desired range. For example, if a pool test indicates a pH of 8.0, applying the appropriate quantity of this acid will bring the pH closer to the ideal range of 7.2-7.8.
Maintaining balanced water chemistry is essential for swimmer comfort, equipment longevity, and effective sanitation. Improper pH levels can cause skin and eye irritation, and can also corrode pool surfaces and equipment, leading to costly repairs. Regular adjustment of pH and alkalinity, using chemical solutions like this acid, has been a common practice in pool maintenance for many decades. Prior to widespread use of automated systems, manual chemical balancing was the only method of achieving water quality standards. This practice continues to be relied upon today, either as a primary method or to supplement automated systems.
