Randy Holmes-Farley
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Example: How much oxygen does it take to raise pH?....I have had this discussion before on the forum. I enjoy having this debate. Yes, oxygen raises PH. Try injecting oxygen into your skimmer and see for yourself.
That question isn't appropriate for this thread either, but as a quickie answer (since I do not want incorrect chemistry info left hanging), adding O2 has zero pH effect.
If the addition of any gas (helium, argon, nitrogen, oxygen, any gas, except CO2 itself) sweeps out CO2 with it as CO2 enters the bubbles and is carried away to the atmosphere, the pH will rise.
We can discuss further if you want to start a new thread.