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Have you ever managed a swimming pool where the alkalinity level fluctuates? Usually, alkalinity decreases each week due to acid use, but what about an alkalinity level that rises? Those of you with CO₂ feeders are probably already familiar with a seemingly endless rise in alkalinity. If you have ever wondered why alkalinity sometimes climbs on its own, this article is for you.

This lesson explains why pH naturally rises. If you maintain pools on a weekly basis, you have probably noticed that the pH is almost always higher after a week. That's not your fault. It's natural. This article explains why.