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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Taking the plunge. Open Fermentation. Yes I'm willing to dump a batch.

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Old 03-25-2012, 01:39 AM   #11
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You will get the exact same beer but with a slightly increased risk of something infecting your batch. To each their own. Some people are religious about not letting anything foreign get into their beer. I ferment lots of batches (including every single one of my lagers) in a 10g wine fermenter with a loose fitting lid and I peek quite a bit.

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Old 03-25-2012, 01:46 AM   #12
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You will get the exact same beer but with a slightly increased risk of something infecting your batch. To each their own. Some people are religious about not letting anything foreign get into their beer. I ferment lots of batches (including every single one of my lagers) in a 10g wine fermenter with a loose fitting lid and I peek quite a bit.
Exact beer? I don't know. I'm changing 2 pretty big variables here. Fermenter geometry and keeping it open, both of which from my study have effects on yeast metabolism and the resulting beer. But who knows?
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Old 03-25-2012, 03:25 AM   #13
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Id only leave it open for a few days then close it up. You will get the benefits butmifmyou leave it open too long mold & bugs may be an issue. Ive always left the lid on my bucket loose for the first 4-5 days - then coner up and airlock - i like to let them breathe it out a bit

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Old 03-25-2012, 03:36 AM   #14
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Brewing TV has a couple of episodes on open fermentation

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Old 03-25-2012, 04:30 AM   #15
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I've done a small amount of open fermentation (by accident) where I split a batch and half was open and half was closed. There is a very noticeable difference in yeast flavors. The open portion is dramatically lower in esters. However after aging the closed portion ended up being the better tasting beer.

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Old 03-25-2012, 04:58 PM   #16
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Chris White suggests leaving the top covered loosely with aluminum foil until the krausen falls. I think that is a better idea than the stainer. You will still get oxygen diffusing in.

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Old 03-25-2012, 05:18 PM   #17
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OP: try to keep this going and report back with your results. I'm interested in the outcome. Thanks!

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Old 03-25-2012, 05:19 PM   #18
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Chris White suggests leaving the top covered loosely with aluminum foil until the krausen falls. I think that is a better idea than the stainer. You will still get oxygen diffusing in.
Yes but who cares if I have oxygen diffusing in pre-fermentation? As soon as fermentation is 75-80% done, I plan on putting in a closed container to condition.
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Old 03-25-2012, 08:14 PM   #19
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Yes but who cares if I have oxygen diffusing in pre-fermentation? As soon as fermentation is 75-80% done, I plan on putting in a closed container to condition.
The point is loose foil will let air in and keep out 'nasties' better than the a strainer. That is why White suggests it.
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Old 03-26-2012, 01:29 AM   #20
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Exact beer? I don't know. I'm changing 2 pretty big variables here. Fermenter geometry and keeping it open, both of which from my study have effects on yeast metabolism and the resulting beer. But who knows?
Hopefully it turns out great!
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