What actually causes a foamer? - Home Brew Forums
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Old 03-08-2009, 07:58 PM   #1
Grinder12000
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I've had two friends give me their home brew this weekend and while both taste good both were foamers.

I've made 22 batches and have had three bottles that were foamers but all three still tasted good.

I'm surprised at one of the ones as it was brewed at a brew your own brewery whre I would assume sanitation would be better then average.


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Old 03-08-2009, 08:00 PM   #2
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What exactly do you mean by foamers? You mean the bottle errupts when you open it?


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Old 03-08-2009, 08:01 PM   #3
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Yea - open the bottle - pour gently and I have 1 inch of beer and 8 inches of foam.

Still tastes good! but . . . . . . . .
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Old 03-08-2009, 08:17 PM   #4
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3 obvious, main causes. One would be an infection in the bottle, whereby the wild yeast or bacteria eat the dextrins that the saccharomyces could not, and thus produces excess co2. You'll probably also notice a funky, off-flavor from this too, along with astringency.

The other cause would be screwing up the priming amounts.

The third, and probably most common, cause is that the yeast stalled during primary fermentation, and left fermentable sugars. Once transferred to bottle, they get roused and start back up, and so you have the co2 from the priming sugar in addition to the co2 from the leftover fermentable dextrins...leading to an excess of co2, and thus, gushers.
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Old 03-08-2009, 08:18 PM   #5
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Either too much priming sugar or bottled too early, before fermentation was finished. Could be a mild infection that's not quite enough to taste; you'll find out if the beers get a lot worse over time.
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Old 03-08-2009, 11:12 PM   #6
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I've seen a tiny dried-on soap crytal on the inside of beer glass cause a perpetual gusher in a tap beer.

Perhaps soap residue in the bottle.
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Old 03-09-2009, 12:08 AM   #7
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I had a couple batches have some overcarbed and undercarbed bottles before I started stirring in my priming mix.No problem since I started stirring.

 
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Old 03-09-2009, 02:16 AM   #8
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Quote:
Perhaps soap residue in the bottle.
how about in the glass???
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Old 03-09-2009, 01:34 PM   #9
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I also had this happen to me on one occasion but it gushed right after popping the top. lost half the beer. Was the only one like it from the batch.

 
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Old 03-09-2009, 03:50 PM   #10
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Quote:
Originally Posted by Grinder12000 View Post
how about in the glass???

If it were in the glass you'd actually see the CO2 bubbles streaming out from that point. Like a tiny piece of mentos in a soda bottle.


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