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Old 10-03-2012, 02:10 PM   #61
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If you blow into the wort aren't you producing & introducing C02?
I was just being a smart a$$, don't ever blow into your wort thats a bad idea.
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Old 10-03-2012, 02:25 PM   #62
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The problem with the aeration/stirring suggestions are that you are going to saturate at a lower O2 concentration than needed if you are brewing a high gravity beer because you are limited by atmospheric O2 concentration. The only way to reach a higher O2 (i.e. >8PPM) is with oxygen. Now can you brew great beer without oxygenation? Sure. But if you are trying to get over 8ppm, you can stir til the cows come home, it isn't happening. Especially with higher gravity worts that will not be able to absorb as much oxygen.

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Old 10-03-2012, 02:37 PM   #63
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A wild thought :- My Son has fish tanks in which he has pumps running to keep up the level of oxygen in the water. Yes it is air & not pure oxygen, however, If I was to plumb in a similar system to my fermenter to keep a constant trickle if air into the wort would or should this help the Yeast?

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Old 10-03-2012, 02:43 PM   #64
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It would help the yeast at first , but then ruin your beer as the alcohol develops.

I wanted to chime in about the over saturation of 02. I let my tank run through a stone(0.5 micron) at full blast (tons of air bubbles reaching the surface) for the whole transfer from kettle to fermenter (about 20 minutes) with no noticeable effects. I wouldn't know that it only required under a minute until I read this thread though.

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Old 10-03-2012, 02:48 PM   #65
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Wise thought thankyou for the reply

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Old 10-03-2012, 04:06 PM   #66
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The problem with the aeration/stirring suggestions are that you are going to saturate at a lower O2 concentration than needed if you are brewing a high gravity beer because you are limited by atmospheric O2 concentration. The only way to reach a higher O2 (i.e. >8PPM) is with oxygen. Now can you brew great beer without oxygenation? Sure. But if you are trying to get over 8ppm, you can stir til the cows come home, it isn't happening. Especially with higher gravity worts that will not be able to absorb as much oxygen.
Another good reason for building up your yeast to the proper cell count with a properly oxygenated starter or dry yeast rather than growing your yeast in the wort.

Fermentation requires no oxygen.
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Old 10-03-2012, 04:17 PM   #67
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Good minds are at work

Regards Travis

Question:- Is Yeast like Leaf on a tree, it absorbs oxygen & produces CO2? (All living organisms require oxygen?)

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Old 10-03-2012, 04:45 PM   #68
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Another good reason for building up your yeast to the proper cell count with a properly oxygenated starter or dry yeast rather than growing your yeast in the wort.

Fermentation requires no oxygen.
So you build up 800 billion cells in your starter? That's just plain silly.
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Old 10-03-2012, 04:48 PM   #69
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Another good reason for building up your yeast to the proper cell count with a properly oxygenated starter or dry yeast rather than growing your yeast in the wort.

Fermentation requires no oxygen.
I've got news for you. You ARE growing yeast in your wort, even with dry yeast or a big starter. You actually want some of the flavors produced during the growth phase to be in your beer (dependent on style, of course).

I make 4L starters on a stir plate. I also use pure O2. Both contribute to making the best beer possible, imho.
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Old 10-03-2012, 09:14 PM   #70
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I've got news for you. You ARE growing yeast in your wort, even with dry yeast or a big starter. You actually want some of the flavors produced during the growth phase to be in your beer (dependent on style, of course).

I make 4L starters on a stir plate. I also use pure O2. Both contribute to making the best beer possible, imho.
I have no problem with what you're saying, but my response had to do with the fact that it is true that it is very difficult to achieve adequate levels of oxygen in higher gravity wort. Even in lower gravity wort you shouldn't expect that you can pitch a smack pack, hit it with some indeterminate amount of oxygen and expect good results. If you pitch enough healthyyeast you don't need to worry about massive injections of pure O2. You will still want to aerate, but you don't have to be so concerned about getting enough in solution or retaining it long enough for adequate yeast growth.
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