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Old 02-04-2009, 07:50 PM   #31
springer
 
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I use a 2 micron stone with O2... But I use Danstar dry yeast most of the time. And their instructions say aeration is not needed I do aerate but maybe I am just wasting O2 .

Something that confuses me also is, why do we aerate the wort when using starters? If we pitch the proper amount of yeast cells they should go right to work and not reproduce ...
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Old 02-04-2009, 08:00 PM   #32
PhlyanPan
 
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Quote:
Originally Posted by GilaMinumBeer View Post
Because not too many of us HB'ers have fermenters that would withstand 30psi? And inline is easier.
Couldn't you just aerate it in the keg like you would carbonate and then rack it to your fermenter once it's aerated? Easier is a valid point though.

 
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Old 02-04-2009, 08:57 PM   #33
BioBeing
 
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Quote:
Originally Posted by springer View Post
Something that confuses me also is, why do we aerate the wort when using starters? If we pitch the proper amount of yeast cells they should go right to work and not reproduce ...
From the wyeast link provided earlier, even well pitched yeast will still undergo one or two doublings, depending on the dO of the wort.

 
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Old 02-04-2009, 09:18 PM   #34
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Quote:
Originally Posted by PhlyanPan View Post
Couldn't you just aerate it in the keg like you would carbonate and then rack it to your fermenter once it's aerated? Easier is a valid point though.
Any oxygen beyond the saturation point (usually about 8.5-11 ppm in water, wort is somewhat lower, depending on its SG) will outgas within a few hours if undisturbed. If you rack or otherwise disturb it, most of what you put in will come out of solution pretty much right away. In other words, you would be throwing money out of the window.

 
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Old 02-04-2009, 09:28 PM   #35
PhlyanPan
 
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Quote:
Originally Posted by ArcaneXor View Post
Any oxygen beyond the saturation point (usually about 8.5-11 ppm in water, wort is somewhat lower, depending on its SG) will outgas within a few hours if undisturbed. If you rack or otherwise disturb it, most of what you put in will come out of solution pretty much right away. In other words, you would be throwing money out of the window.
Gotcha. Didn't know that. Well that makes it a pretty stupid idea then. Thanks!

 
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Old 02-04-2009, 09:34 PM   #36
moti_mo
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I always put the end of my auto-siphon tubing into two re-usable mesh hop bags and siphon through these bags into the carboy. This serves the two purposes of 1) coarse filtration of the wort, and 2) oxygenating the wort - I always have several inches of froth on top of the wort once its in the carboy. I always get really fast take-offs using this method.

 
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