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Old 05-14-2012, 05:29 PM   #1
MacAztec
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Default Forgot to aerate my wort: How long after pitching yeast can I aerate?

I brewed last night, and forgot to aerate my wort after pitching my yeast (I had a nice starter I pitched). I'd like to aerate, but I don't want to affect the flavors too much.

How long after pitching can I aerate? I was thinking of dropping a air pump tube (sanitized) in there, hooked up to an air pump. If I do this within 24 hours of pitching the yeast, will I screw things up?

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Old 05-14-2012, 05:36 PM   #2
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Should be Ok, you want the yeast still going strong, or ramping up.


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Old 05-14-2012, 05:43 PM   #3
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As far as I know, you should be ok within the first 12 to 24 hours. Here is a link to White Labs explaining the yeast life cycle. http://www.whitelabs.com/beer/Yeast_Life_Cycle.pdf

I've read that some brewers will oxygenate their beer when pitching but then require a second oxygenation the following day, for very big beers if memory serves. I hope this helps a little, and hopefully someone who is more of an expert will be able to expound.
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Old 05-14-2012, 05:46 PM   #4
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That is ONLY for big beer, beers over 1.080. Typical beers should not be aerated at all if there's any chance that fermentation has already started.

Remember long before we ever read about how important it was to aerate we made at least 1 batch without doing that, and the beer managed to turn out fine.

If it's a normal grav beer I wouldn't risk potential oxidation by late aeration.
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Old 05-14-2012, 05:53 PM   #5
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Alright - not sure what to do based on the advice. I would be aerating ~19 hours after pitching the yeast. Too dangerous?
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Old 05-14-2012, 06:10 PM   #6
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I would defer to Revvy on this and not aerate.
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Old 05-14-2012, 07:22 PM   #7
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Agreed. I aerate by pouring my wort into the fermenter. I make Fantastic beer.
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Old 05-14-2012, 07:48 PM   #8
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I never aerate more than just what happens when I siphon from the kettle to the fermenter. Never had a problem with slow starts or stuck fermentation.


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