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Old 12-16-2007, 09:18 AM   #1
ohad
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I made my very first batch of all-grain, after several extract batches, and all went well. The one small thing I forgot to do is to airate the wort. I usually do this by giving the wort several minutes of generous stirring and splashing in the fermenter when already cool.
this small error is driving me insane...
I smelled the bubbles thats coming out of the air lock, and it smells excellent, but way too fruity , like very ripe peaches. (about 24 hours after fermentation began)

a little more info:
its quite a simple pale ale, with 250g acidulated malt and cascade hops.
the fermentation temp is 17C

what problems can evolve from under airating the wort?
Is there a connection between low oxygen and ester production?

any other ideas or comments are welcome

 
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Old 12-16-2007, 09:39 AM   #2
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you will be fine- just might be a slightly slower ferment
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Old 12-16-2007, 09:41 AM   #3

Quote:
Originally Posted by ohad
what problems can evolve from under airating the wort?....

.....any other ideas or comments are welcome

Low amount of aeration will result in a slow fermentation start. Not a big deal if you sanitize well. The yeast will aerate on their own.

Don't worry about this. One way to get around this is to cut a few holes in your syphon tube right above a slide-on clamp or hose shut-off near to the discharge so as to cause turbulance/aeration. Forcing the wort to exit at the cut-outs above the stopage. Anything to redirect the flow and cause aeration at syphoning is good. You can always give the primary a good bunch of swirls or a few up/down shakes after pitching the yeast - then insert the airlock.

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Old 12-16-2007, 01:00 PM   #4
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Would a lees stirrer work for aeration, After the pitch? I use it with the wine.

 
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Old 12-16-2007, 03:50 PM   #5
Rich the Brewer
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Relax, your beer will be fine. Just be patient.

I usually don't aerate the wort. It just gets what air infuses into the wort when I siphon into the primary. I also just sprinkle on dry yeast and don't stir it in. Fermentation is starts in 8 hours and usually finishes up in three days or so for a pale ale.


 
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Old 12-16-2007, 06:22 PM   #6
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aeration is a good idea. a lot of people, including myself, use a pure oxygen tank and a stainless airstone to boost oxygen.

it results in a healthier yeast, and a shorter lag time.

you're only at 62 degrees...that's a little chilly for some ale yeast. I don't think the peach smell is anything to worry about. never smelled peach esters, so I think its just your beer.
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Old 12-16-2007, 06:33 PM   #7
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Quote:
Originally Posted by malkore
aeration is a good idea. a lot of people, including myself, use a pure oxygen tank and a stainless airstone to boost oxygen.

it results in a healthier yeast, and a shorter lag time.

you're only at 62 degrees...that's a little chilly for some ale yeast. I don't think the peach smell is anything to worry about. never smelled peach esters, so I think its just your beer.

+1 on using oxygen. Fast and easy. Plus I leave the red bottle near to where I pitch the yeast. Kind of hard to forget..
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Old 12-16-2007, 06:40 PM   #8
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I'm kind of behind the curve on aeration myself. I will probably get an Oxygen setup next. I have found that making a good sized yeast starter overcomes a lot of
aeration sins. still, everything I read points to the importance of aerating full boil brewing.

 
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Old 12-16-2007, 06:58 PM   #9
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I use a wort wizard and have never had issues it aerates the wort nicely, If it's a particulary high gravity batch then I use an aquarium pump with a stone for about 15 min (usually set it while I clean the keggle then pitch after cleanup is done)

 
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