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Old 08-21-2009, 07:27 AM   #1
Beernewb
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Default Those who use oxygen canisters to aerate...

before of after the addition of yeast?

thx

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Old 08-21-2009, 08:14 AM   #2
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When I've done it in the past, I do it before I add the yeast.

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Old 08-21-2009, 11:03 AM   #3
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I generally do it before I add the yeast. Depending on how well you can control the injection rate you can create a lot of foam that rapidly runs up the neck of a carboy. I'd rather not be blowing the yeast out of the fermentor.

I inject for about 60 seconds or so. If there is a lot of foam I give it a couple minutes to settle, then I pitch the yeast and swirl the carboy to mix them in.

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Old 08-21-2009, 11:55 AM   #4
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In the big scheme of things, I am not sure it matters, however, if your stone is making a lot of foam you may want to dial back the pressure anyway. Any o2 that bubbles to the surface isnt going into solution, and is therefore wasted.

Usually I aerate for a minute or two right at the end of my chill when I am getting impatient with my immersion chiller. Then I fill the carboy and pitch the yeast once I get to the correct temp (usually a couple hours later in the summer).

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