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Old 11-03-2013, 01:18 AM   #1
JSappenf
 
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How do you know when your beer is done fermenting? Is it when it clears? Is it when it is done bubbling? Is it when it reaches a certain specific gravity? How do you know that fermentation hasn't just stalled?

 
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Old 11-03-2013, 01:24 AM   #2
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Hydrometer....

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Old 11-03-2013, 01:28 AM   #3
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Take 3 gravity readings over as many days, if the reading is the same over the three days it's done, simples!

 
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Old 11-03-2013, 01:34 AM   #4
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It's "all of the above", sort of.

Sure, stable hydrometer readings are part of it. But to verify that it's done (and not stuck or slow), there are some other signs as well. One is that the beer will start to clear and visible activity will slow or stop.

When checking the hydrometer readings, not only should they be stable, but they should be at a reasonably expected FG. What I mean is that if the hydrometer reads 1.042 for three days, for most beers that wouldn't be finished- that would be stuck.

But if it reads 1.018 for more than three days (even if slightly higher than expected), it's starting to clear, the krausen has dropped, and it looks like beer, then it's done.

A reading that is higher than is expected should be investigated to make sure it's done.
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Old 11-03-2013, 01:39 AM   #5
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I have never kept an eye on my beers. I let them sit in primary for 3 weeks. When I go to bottle I use a hydrometer. If it is below 1.020 I bottle. If not, I'll raise the temp and rouse the yeast for another week.
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Old 11-03-2013, 01:17 PM   #6
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Yeah,sometimes temp swings for instance can cause it to stall out. Gently swirl the fermenter to stir up some yeast & warm the fermenter up a little. It can take a day to get going again if it does at all. I try to get it as close to expected FG as possible in this instance.
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Old 11-03-2013, 02:19 PM   #7
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Quote:
Originally Posted by unionrdr View Post
Yeah,sometimes temp swings for instance can cause it ti stall out. Gently swirl the ermenter to stir up some yeast & warm the fermenter up a little. It can take a day to get going again if it does at all. I try to get it as close to expected FG as possible in this instance.
Well so I was brewing two batches at once and I mixed up my extracts. So my original specific gravities are off.

 
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Old 11-03-2013, 03:17 PM   #8
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It'd be off a little,but 1.020 is still alittle high for an average gravity brew.
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Old 11-03-2013, 07:25 PM   #9
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Quote:
Originally Posted by unionrdr View Post
It'd be off a little,but 1.020 is still alittle high for an average gravity brew.
So my 5 gallon Lambic started off at 1.034 and my 3 gallon Belgian started off at 1.100.

 
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Old 11-03-2013, 07:48 PM   #10
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That's possible,if you,for instance,used the same amount of fermentables in both. relative to the OG's anyway.
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