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I mixed my first batch about 7 hours ago. I was told to put the mix and sugar into this bucket then in a week transfer it into the secondary fermenter.

I just walked by and see the lid on the bucket is very bulged out and I'm concerned it'll blow!

Picture: Bulging bucket

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3  
As as immediate solution before you install an airlock (as demonstrated in the answers), I'd recommend cracking the lid ever so slightly on one side. This may expose it just enough to infect it, but it's better infected than exploded all over your walls/ceiling/floor. Trust me. –  Scott Oct 15 '13 at 3:48
    
... By cracking, I of course mean opening the lid just a little bit to let the pressure out (just wanted to clarify so that you don't take it too literally). You can seal it back up again, just so long as you let the pressure out every couple of hours. –  Scott Oct 15 '13 at 3:59
    
Yes I agree with @Scott I should have included that in the answer. Slightly lift the lid of the barrel to release pressure then reseal it. –  WillNZ Oct 15 '13 at 4:36

2 Answers 2

up vote 4 down vote accepted

it might help to know what you are brewing.

I can't see an airlock on the bucket so depending on what you are brewing you may have to add an airlock so the CO2 can escape the barrel. This would stop it blowing up!!!

Again without knowing what you are brewing it is hard to give any advice.

If you want to know more about airlocks take a look at this video. CraigTube

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Brewing a muntons irish stout. –  CaffGeek Oct 15 '13 at 3:57
    
Do you have an airlock on the fermenter? If not then that is your problem. I would recommend checking out the video I put in the answer and it will teach you about air locks. –  WillNZ Oct 15 '13 at 4:07
    
No air lock. Bought everything from the local brew supply store. The pail had no opening for it, and they said nothing about making an opening. Hopefully just relieving pressure is good for the next while until I can modify the pail –  CaffGeek Oct 15 '13 at 4:38
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Ok I would follow Scotts suggestion until you can buy an airlock and fit it. While your at it have a go at the guy at the home brew store and ask why they didn't tell you that you needed one –  WillNZ Oct 15 '13 at 4:42
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@CaffGeek - The airlock is definitely for primary fermentation since that's when most of the carbon dioxide is produced. –  mdma Oct 15 '13 at 13:45

You need an air lock to let out the gas. When making beer you're essentially creating a batch of yeast food- gas (CO2) and alcohol are the yeast "poop". You need to give that gas somewhere to go.

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