Because dissolved CO2 must leave the pool and equalize with the CO2 in the air, pH naturally rises until equilibrium is reached. We at Orenda call this point the "pH ceiling." But there are a few ways to resist this, and suppress pH. This episode discusses them.
00:00 - Intro
02:01 - Recap of Henry's Law of differential pressures. Any gas dissolved in a liquid will equalize with that same gas above the liquid.
04:36 - If you exceed the pH ceiling, the atmosphere will literally push CO2 back into the water.
04:57 - Where does CO2 come from when adding acid? It converts bicarbonate into carbonic acid (dissolved CO2).
07:50 - We don't want bicarbonate ions to convert into carbonate ions (at 8.3 pH or higher) because carbonates are attracted to calcium ions, creating calcium carbonate.
12:12 - How can we stop the rise of pH? How can we suppress pH?
12:39 - Analogy of the beer: what can you do to stop the beer from going flat? Think of it that way. How can you stop (or slow) the loss of CO2?
16:36 - Three categories of ways to suppress pH: cover the pool, chemically suppress it (acid feeder, CO2 injector, trichlor chlorine), and have very low alkalinity or high CYA to lower the pH ceiling.
18:53 - Explanation of sense-and-dispense acid feeders, and the challenges with them (overfeeding acid).
23:36 - If you don't have any of those reasons listed, but your pH is still being suppressed, please contact us! Teach us so we can learn more about this topic.
26:25 - Conclusion. Thanks for listening!
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