4 votes
Accepted

Is it bad to let air into my primary fermenter?

Any way you take a sample (unless it's from a pressurized vessel with an outlet) will draw air in. As you suspect, it should be a small amount, and given that your beer A) may still be fermenting (...
4 votes
Accepted

When to oxygenate when you delay pitching the yeast?

I would oxygenate (pure O2) right before or after the pitch. Just because the process has the chance to introduce bacteria or wild yeast and it's best if the yeast is there to become dominate ...
4 votes

Closed environment vs open environment in brewing

You've already understood the general practice. Air (really oxygen) is needed in the wort prior to pitching so the yeast can grow and replicate. After pitching, a sealed environment is desired. I ...
  • 982
3 votes
Accepted

Can I use oxygen tablets or liquid oxygen to oxygenate my water for yeast fermentation in mead?

I wouldn't think of these things necessarily food safe. I wouldn't be adding something like this to my beer/mead without knowing what other substances are in it. You are overthinking the oxygenation/...
  • 36.2k
3 votes
Accepted

Possible to de-oxygenate and de-skunk a beer?

I think that's sort of like reversing a piece of wood in a fire being burnt. The beer has gone through chemical changes- it's nontrivial to reverse them. I'm not aware of any commercial or home-scale ...
  • 1,551
3 votes
Accepted

Why is oxygen bad for mead?

You are confusing a couple of things. You want oxygen for a robust fermentation, no doubt about that. BUT, after the primary fermentation is done, you want to cut off the supply of oxygen otherwise ...
  • 3,002
3 votes

Is **long** wort aeration a feasible alternative to using pure oxygen?

Yes, it definitely should be a feasible method. Yeast will rapidly (within a matter of hours) consume the oxygen that has been provided, at which point you may provide it more and it will happily ...
3 votes
Accepted

Green apple taste with beer that used bucket with lid with no gasket

Generally green apple (acetaldehyde) is due to fermentation not being complete. Did you cold crash? Did you verify that your beer was done fermenting? It is strange that your fermenter builds up so ...
  • 2,446
2 votes

Is oxygenating after brew day okay?

My experience as as professional brewer and home brewer leads me to suggest that oxygen is not detrimental to beer flavor unless yeast activity is in decline (i.e., after vigorous fermentation has ...
  • 363
2 votes
Accepted

Is oxygenating after brew day okay?

The yeast need the oxygen to grow and reproduce, which is important for the first stage of primary fermentation when the yeast is multiplying and inhabiting your wort, which you want to happen as ...
  • 266
2 votes

Is oxygenating after brew day okay?

Once fermentation has started it is usually not recommended to add oxygen. Exceptions: When brewing a high alcohol beer you may add oxygen up to 12 hours after pitching, but not afterwords. Yeast ...
  • 2,446
2 votes

Is **long** wort aeration a feasible alternative to using pure oxygen?

The other solution is to pitch enough yeast to make aeration unneeded or at least less necessary. That's what I do.
  • 33.3k
1 vote

Possible to de-oxygenate and de-skunk a beer?

Cardboard flavours are not the result of oxygenation but of oxidation. Oxygen has chemically bonded to chemical compounds in the beer and permanently changed them. While this process should reversible ...
1 vote

Can I use oxygen tablets or liquid oxygen to oxygenate my water for yeast fermentation in mead?

The basics: just mix it up. I've made a few 5-gallon batches of mead, 30-some by this point. When mixing together my must at the start of a batch, I used to use just a big steel spoon to stir the ...
1 vote
Accepted

Brewing a Flanders Red Bruin/Historic C18 Porter?

Well, first of all, the grain bill is not one of red flanders. There's no place for chocolate malt, nor for flaked corn. 8 kg base malt is gonna give you too high OG for the style (assuming you're ...
  • 1,488
1 vote

Is **long** wort aeration a feasible alternative to using pure oxygen?

I think the aeration method outlined would work by making a lower but more prolonged level of O2 available - but it might be over elaborate or even unnecessary. The need for oxygen during ...
1 vote
Accepted

Bernzomatic oxygen bottles to oxygenate beer

I took the attachment back to the homebrew store and they replaced it and attached trhe replacement themselves. Since then I have used the bottle for several batches. I guess it was a defective gasket....
  • 190
1 vote
Accepted

Closed environment vs open environment in brewing

The factors determining oxygenation are yeast health vs taste of the beer. Ever tasted a starter culture, or a bottle that was only bottled a couple days ago? They will be full of acetaldehyde, the ...
  • 3,030

Only top scored, non community-wiki answers of a minimum length are eligible