What issue does low alkalinity in pools cause?

Low alkalinity in swimming pools can lead to "pH bounce," which refers to the rapid fluctuation of pH levels. This is because total alkalinity serves as a buffer for the pool's pH, stabilizing it and preventing drastic changes. When alkalinity is low, any addition of acids or bases can cause the pH to increase or decrease significantly, leading to instability.

Keeping alkalinity at the proper levels is crucial for maintaining a balanced water chemistry, which not only helps keep the pH stable but also enhances the effectiveness of chlorine in sanitizing the pool. If the alkalinity is not properly managed, the pool can experience frequent pH swings that complicate maintenance and affect swimmer comfort.