In simpler terms, total alkalinity is a measurement of the water’s ability to resist change in pH. In particular, alkalinity slows the reduction of pH. Too much alkalinity is actually a source of rising pH. The more alkalinity you have, the more acid it takes to reduce pH.

How does pH relate to alkalinity?

In simple terms, pH is the concentration of acid protons [H+]. On the other hand, the alkalinity of a solution is its ability to neutralize acids. … This makes it so that a significantly higher quantity of acid is required to lower the pH compared to a solution that does not contain these ions.

How does lowering pH affect alkalinity?

Low pH also tends to lower total alkalinity. High pH is also a problem for your pool. When the pH is too high, your water is very basic. That can cause scaling on the walls and other components of your pool.