Originally Posted by bbognerks
We've had great results with opening it up to where the bubbles just barely break the surface of the liquid. Otherwise you're just wasting O2. Let it go for 1 minute (2 micron stone) and call it good.
This! Gas exchange into liquid occurs slowly, so the most ideal method is tiny bubbles, moving slowly.
I actually run mine barely opened..enough that i can see bubbles if the wand is at the top of the wort. then I submerge it and just gently stir the wort with the wand for a minute or so.
No bubbles really hit the surface, which means the O2 is gettign into solution...the ultimate goal here.
Be sure to always unscrew the regulator from the bottle, since they tend to leak otherwise (the bottles are so cheap the tolerance for the valve pin is wide and it might be depressed with the regulator closed but screwed on all the way.
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