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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.

Total Alkalinity (TA) often gets confused with pH and words like alkali and alkaline. This topic is widely misunderstood in the pool industry. Most of us know how to test for TA, but may not know what it actually is, what it does, and why it's important.