9 possible combinations

 

pH is one of the key indicators of pool water quality, directly affecting both swimming comfort and the effectiveness of the entire care system. If the pH level falls outside the normal range, it can cause a number of problems: from skin and eye irritation to reduced disinfection effectiveness and scale formation on equipment. 

Total alkalinity plays an important role in this process, acting as a buffer and helping to keep pH within a stable range, preventing sharp fluctuations. 

These two indicators are closely related: if alkalinity is outside the norm, the pH level becomes unstable and difficult to adjust. That is why proper control of pH and total alkalinity allows you to solve most water balance problems at an early stage and avoid more complex and expensive maintenance in the future.

Below are the main options and methods for adjusting pH and total alkalinity.
Why does the pH constantly "jump" and not stay stable?

The most common reason is an incorrect level of total alkalinity. If alkalinity is too low, pH changes quickly. If it's too high, it's difficult to lower it. That's why you should first adjust the alkalinity and only then work with the pH.
What's more important to adjust first—pH or alkalinity?

Always start with alkalinity. It acts as a buffer and stabilizes pH. If you adjust pH immediately without normalizing alkalinity, the result will be short-lived and unstable.
What are the consequences of incorrect pH in a swimming pool?

When the pH level is low, water becomes aggressive: it can cause skin irritation, equipment corrosion, and material degradation. When the pH level is high, chlorine effectiveness decreases, and turbidity and scale appear. In both cases, maintenance costs increase.
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