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13 votes
Accepted

Do alcohol vapor escape through the fermentation / air lock?

Not at all. Technically, you may be losing an absolutely, immeasurably tiny amount of alcohol, but it would have to vaporize from the beer, absorb or condense into whatever liquid is in your airlock ...
10 votes
Accepted

Beer blew up into the airlock. What's next?

Just clean it up and replace the airlock sanitizer fluid. If you have a second airlock just prep it and swap. If not just cover with sanitized foil while cleaning.
8 votes

White sediment inside my airlock

Looks just like yeast to me. If foam rushed into your airlock, this is really probable. Sugars are dissolved and you won't see them as a layer. I would replace the airlock with clean one - that way, ...
  • 3,718
8 votes

Having doubts about my first stout

At what temperature did you eventually mashed? Not sure how it works out with BIAB, but adding grains to a regular mash (even less volume compared to BIAB), the temperature only drops a few °C's. My ...
7 votes
Accepted

I forgot to put water in the airlock! What do I do now?

Seal the beer off from oxygen as soon as possible. If you decide to use the airlock, use sanitized water only. If you have access to CO2, put a layer of the gas over your beer as soon as possible (...
7 votes
Accepted

Airlocks and long term unsupervised fermentation

Question 1 is hard to answer because its so dependent on the relative humidity and air flow of the room in question. I wouldn't assume an airlock with water would be safe for more than 4 weeks without ...
  • 6,682
7 votes
Accepted

Worried about oxidation

It's fine. I assume the beer is still actively fermenting, in which case not only will freshly-produced CO₂ (somewhat) displace the O₂ in the headspace, but the yeast can still clean up any O₂ that ...
  • 10.1k
7 votes

Put the airlock really high could avoid blowing?

If fermenting in a corney keg you will never yield 5 gallons of finished beer. If 5 gallons finished beer is the goal use 6-6.5 carboys and brew 5.5-6 gallons of beer. Primary yeast cake easily ...
7 votes
Accepted

Airlock has a bug inside

Generally speaking it is safer to remove, clean/sterilise and replace the airlock. It should only take 30 seconds and the vent hole can be covered with an inverted glass to prevent any accidental ...
  • 5,611
7 votes
Accepted

Starsan in double bubble airlock keeps getting sucked into fermenter - why and how to prevent?

This is caused by a drop in temp before co2 is being produced. Just cap the fermenter in sanitized foil until you're past the lag phase, or cooled to fermentaion temp. Though a little bit of starsan ...
5 votes
Accepted

My airlock keeps becoming empty on one side, is that normal?

Totally normal. C02 is SLOWLY pushing the water to the opposite side of the lock. As fermentation starts to really kick in, you'll see much more movement and "bubbling" in the airlock.
5 votes

Do alcohol vapor escape through the fermentation / air lock?

Alcohol Losses from Entrainment in Carbon Dioxide Evolved during Fermentation H. W. Zimmermann, E. A. Rossi Jr. and E. Wick + Author Affiliations Research and Development, United Vintners, Asti, ...
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5 votes
Accepted

Airlock not bubbling

If you didn't pitch yeast from an actively fermenting starter, 24 hours is a perfectly reasonable lag time. But if you really are seeing a thick kräusen atop your beer, it sounds like there's just a ...
5 votes

Will this home-made airlock work?

It will probably be OK. The smaller the bore of the tube, the greater the tendency will be for any bubbles to push the liquid right out. You could just make a blow-off instead by submerging the ...
5 votes

Airlock Blow now no bubbles

If you were getting beer/yeast coming out of your airlock, it seems safe to say your beer was fermenting, perhaps quite vigorously. It's not uncommon for a beer to ferment completely within a few days,...
5 votes

Has your airlock ever shot out of your carboy?

It usually happens with strong fermentation when the krausen clogs the airlock, it is then ejected with the pressure. If the fermentation was still active when you returned, the beer might not be ...
  • 4,736
4 votes
Accepted

Why bother with airlock when I can just leave the tube going to the bleach water in place?

Short answer: sure, that is fine and jsled is absolutely right. Long answer: the other thing to consider is just don't bother with blowoff, which I assume is the reason for the bleach water setup, ...
  • 366
4 votes
Accepted

How bad can this be?

Removing your airlock will most likely not ruin your beer, at least not right away. I remove the lid of my fermentor to take a specific gravity reading from time to time, and I never ruined a batch ...
  • 4,736
4 votes

Airlock was removed from wine carboy - is it still ok?

No way to really know. For sure it will be more oxidized. It will be a flaw in taste, but no one can know how big one. Real danger is with flood. Flood promotes mold, and other bad microorganisms. ...
  • 3,718
4 votes
Accepted

Contamination from airlock

I think the likelihood of a batch getting contaminated this way is pretty low. Certainly be careful with cleaning and replacing the airlock. But generally speaking the airlock serves as a blocker ...
  • 1,890
4 votes

Airlock won't stay in carboy

I use this style. I press them all the way down to the lip. Wet or dry they stay put. Take a little work and patience to get out though.
3 votes
Accepted

Water level low on airlock. Is it contaminated?

Your beer will most probably not be infected. Yeast are quite aggressive at this point in the fermentation and will kill any bugs that fell in. I use vodka in my airlock. It guarantees that no bugs ...
  • 2,446
3 votes

is it normal for vigorous bubbling in airlock right away?

Perfectly normal. Properly rehydrated dry yeast or a good liquid starter will do this.
  • 3,030
3 votes

Airlock and Stopper Rocket

The beer should be fine. With the yeast active like it is, bacteria and wild yeast would have a very hard time establishing a foothold. Brief exposure to the atmosphere should not affect your beer.
  • 8,978
3 votes

I forgot to put water in the airlock! What do I do now?

Your beer is almost certainly fine, and you don't need to do anything except fill the airlock with water, and attach it to the fermenter. The release of CO2 in the fermenting beer creates positive ...
  • 8,978
3 votes

I forgot to put water in the airlock! What do I do now?

RDWHAHB. Your beer is probably fine. Gases generally flow out during primary fermentation, not draw in. If you want to leave the beer in primary for a while, put some water in the airlock. If you want ...
  • 1,432
3 votes

Airlock required for lagering or conditioning?

You used the term "lagering", so if you are truly lagering, the answer is 'it depends'. If your beer is indeed a lager, then your yeast WILL be active....potentially down to freezing temperatures (if ...
3 votes
Accepted

Airlock started bubbling after racking into secondary and dryhopping, why?

Fermented beer contains somewhere around 0.8 volumes of CO₂. When you rack to secondary, you're certainly causing some (however minimal) agitation of the beer, which will cause some CO₂ to be released....
  • 10.1k
3 votes
Accepted

Fermenting bin lid bulging

For primary, all I usually do is just putting lid loosely on my tank. Without snapping it in place. Worked for me like a charm. Huge amounts of CO₂ will blanket against air pretty well. Just be ...
  • 3,718
3 votes

Why bother with airlock when I can just leave the tube going to the bleach water in place?

Yes, you can leave the blow-off tube in place if you like. It is just a big airlock, anyways.
  • 10.1k

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