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Old 01-16-2007, 10:43 PM   #1
Brewzilla
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Oct 2005
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Is there such a thing as over-oxygenating the wort? I bought the "oxynater" and have been aerating with pure oxygen and since I have krausen coming through the airlocks and blowing tops off my carboys along with very aggressive fermentation. Is this common?

 
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Old 01-16-2007, 10:55 PM   #2
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How long did you let the O2 run for? I don't have an O2 system, and have still had blow-offs. They're common, especially on big beers, or when you pitch on a yeast cake. Get a blow off tube and that will solve the problem.
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Old 01-16-2007, 11:14 PM   #3
Brewzilla
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I just let the O2 run until the foam hit the top of the fermenter, like the directions indicated. It was like a volcano coming out of the carboy. I'll look into blowoff tubes, Thanks.

 
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Old 01-16-2007, 11:18 PM   #4
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The simplest is just a 1'' vinyl tube (or whatever diameter fits snug) that you put into the neck of the carboy. Then put the other end of the tube in a pitcher or bowl of water.
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Old 01-16-2007, 11:31 PM   #5
casebrew
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Brewzilla, how warm are you fermenting? My worst blow-offs happened in warm temps.
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Old 01-16-2007, 11:35 PM   #6
Brewzilla
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I am fermenting at room temp. 65-80....

 
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Old 01-17-2007, 12:08 AM   #7
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To answer the first question, no. There is a limit to how much O2 the wort will absorb (about 33 ppm). But reaching that limit makes for strong ferments. So, I'd have to agree that you really have a blow-off control problem.
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Old 01-17-2007, 06:20 AM   #8
Mike-H
 
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are you using a 6.5 or 5 gallon carboy for your primary?

 
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