49 replies to this topic

[Bklmt2000]

what kind of things would you see?

 

Depends; sometimes I'd see the yeast wouldn't settle out, as in not at all.  Sometimes the yeast and/or the beer would have wierd colors, or odd-looking bits of debris, odd stuff floating on the surface, etc.  Any of those would be signs of suspect yeast that I don't want to repitch.

 

These days, when I harvest yeast, I see yeast/liquid separation starting within minutes; by the next day, the yeast is usually settling out nicely.

[denny]

so I suspect i'm nearly out of O2 in my tank.  I can turn the flow rate way up and I still only get a little fizz out of the stone.  I'm guessing my next brew will finish off that tank.  I'm a little scared to make the following brew which will likely be a highish gravity lager.  do you non-oxygenators also not do it for lagers?

 

denny, are you using the 007 starter method?  for me that would usually mean making a 2-3L starter about 24 hours before pitching into ~10 gallons of wort.

 

drez - same question?  I'm pretty sure you are.  made any big lagers with it along with no O2?

 

Yep, I use it for every beer under 1.080.  For beers over that I use slurry.

[djinkc]

I may rig up a Venturi aerator for grins and see what happens

[positiveContact]

I may rig up a Venturi aerator for grins and see what happens

 

I'm in a perfect position to use one of these with my large drop from kettle to fermentor.  I'm surprised there isn't something cheap I can just buy.

[djinkc]

I'm in a perfect position to use one of these with my large drop from kettle to fermentor.  I'm surprised there isn't something cheap I can just buy.

I would guess there are a million ways to diy it

[positiveContact]

I would guess there are a million ways to diy it

 

what I'd really want is something SS so I can boil it.  I worry about drilling holes in plastic b/c of little rough edges for bugs to take hold and live.

[positiveContact]

I wonder if some people don't need to add much O2 because of this.  Since I put all the trub in my kettle I would guess I'm on the lower requirement end all other things being equal.

 

https://www.wyeastlab.com/oxygenation/

 

The unsaturated fatty acids found in wort trub can be utilized by yeast for membrane synthesis.  If wort trub levels are low, yeast will need to synthesize more of these lipids and therefore will require more oxygen.

Edited by pickle_rick, 07 January 2019 - 05:11 PM.

[jayb151]

I wonder if some people don't need to add much O2 because of this.  Since I put all the trub in my kettle I would guess I'm on the lower requirement end all other things being equal.

 

https://www.wyeastlab.com/oxygenation/

 

The unsaturated fatty acids found in wort trub can be utilized by yeast for membrane synthesis.  If wort trub levels are low, yeast will need to synthesize more of these lipids and therefore will require more oxygen.

 

Damn, Yea. Did I read that right? If I put more trub in the fermentor, I can not worry as much about O2?

[positiveContact]

That's what it says.

[denny]

I may rig up a Venturi aerator for grins and see what happens

 

Used one of those for several years.  Saw no difference between that and not using it.

what I'd really want is something SS so I can boil it.  I worry about drilling holes in plastic b/c of little rough edges for bugs to take hold and live.

 

Didn't intend to +1 ya.  You're worrying about nothing.

I wonder if some people don't need to add much O2 because of this.  Since I put all the trub in my kettle I would guess I'm on the lower requirement end all other things being equal.

 

https://www.wyeastlab.com/oxygenation/

 

The unsaturated fatty acids found in wort trub can be utilized by yeast for membrane synthesis.  If wort trub levels are low, yeast will need to synthesize more of these lipids and therefore will require more oxygen.

 

That's certainly one reason.  Pitching the right amount of healthy yeast is another.