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Old 05-02-2009, 04:30 PM   #1
briewer2
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Default Consensus on pure O2 aeration

I recently got one of those pure O2 aeration systems and a disposable benzomatic tank. I want to know how long I should run it for. I have read many of the posts about this and have found times between 30 sec w very little flow, to a few minutes at full blast. So I figured I would be safe doing about 45sec, until the product showed up with directions that say to pump for 15-30 MINUTES. I just want someone who has done it a lot to tell me how long they do it. I assume the OG also is a factor. Like I said, I only did it for about 45sec last night, and then pitched a full yeast cake (O.G. was about 1.085). Am I good, should I do it some more?.... IM FKING TIRED OF OFF FLAVORS FROM SLOW FERMENTATIONS (that emoticon really expresses how I feel)



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Old 05-02-2009, 04:59 PM   #2
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Well, I am sure that there are some real scientific numbers, but here's what I do.

First I use a stainless stone that I got from Austin Homebrew.
I sanitize the hell out of the stone and tube. I put it into the ferm, give the ferm a swirl, then open the 02.

You'll notice that the valve is a lot more like on/off than control.
You'll know when it is areating. When the "band" of areated wort reaches all the way around, or when foam reaches the top, your golden.

I just did one last night. Into the ferm @ 7:00pm, krausen at 8:00am, 1.060 w/ 1L starter. Every one I've done has been similar.



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Old 05-02-2009, 05:33 PM   #3
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60 seconds per 5 gallons is plenty!

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Old 05-02-2009, 05:42 PM   #4
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Quote:
Originally Posted by lrr81765 View Post
When the "band" of areated wort reaches all the way around, or when foam reaches the top, your golden.
I was wondering what that was. I saw the band afterwards, but I just bubbled until a bit-o-foam came out the top.

I'm gonna call fermentap and figure out why it says "you need a total time of about 30-120 minutes. We use 45 minutes for normal gravity worts (more for higher gravity worts)"
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Old 05-02-2009, 06:33 PM   #5
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Quote:
Originally Posted by briewer2 View Post
I'm gonna call fermentap and figure out why it says "you need a total time of about 30-120 minutes. We use 45 minutes for normal gravity worts (more for higher gravity worts)"
I'd bet money those directions (30-120 minutes) are for "seconds", not minutes.

I hit my high-grav brews with 2 minutes of O2. latest edition of BYO mentions 2 minutes, as well.
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Old 05-02-2009, 07:33 PM   #6
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been using the red tanks for years. Same as Irr81765 with cleaning, etc. While you can go for 'full blast' - that seems wasteful and inefficient, so I go for just visible bubbling from stone, and I go for 60 seconds.
Been getting decent starts, but I might bump up to 90 secs, to see if they start faster - usually about 24hrs w/o starter, 8-12 with.

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Old 05-02-2009, 07:43 PM   #7
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Quote:
Originally Posted by briewer2 View Post
I was wondering what that was. I saw the band afterwards, but I just bubbled until a bit-o-foam came out the top.

I'm gonna call fermentap and figure out why it says "you need a total time of about 30-120 minutes. We use 45 minutes for normal gravity worts (more for higher gravity worts)"
My guess is that they are referring to using an aquarium pump versus pure O2. I takes longer if using an aquarium pump.
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Old 05-02-2009, 11:53 PM   #8
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Yeah, is it possible the directions were in the bag with the tubing and diffusion stone and NOT the O2 regulator? 30 minutes would be for air pump, not pure O2. I used 60-120 seconds.

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Old 05-04-2009, 03:48 PM   #9
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Quote:
Originally Posted by Hang Glider View Post
been using the red tanks for years. Same as Irr81765 with cleaning, etc. While you can go for 'full blast' - that seems wasteful and inefficient, so I go for just visible bubbling from stone, and I go for 60 seconds.
Been getting decent starts, but I might bump up to 90 secs, to see if they start faster - usually about 24hrs w/o starter, 8-12 with.
If you think about it, more oxygen should produce a longer lag time because fermentation doesn't begin until all the oxygen has been eaten up by the yeast. I think, the benefit of more oxygen is that it increases your overall cell count, because the yeast propogate while there is oxygen.

In practice, my longest lag times were experienced when i used o2

Side note: personally i only bother with o2 with bigger beers, i like to feed my wort air from a pump for 30 to 45 minutes after pitching.
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Old 05-05-2009, 10:40 PM   #10
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I find my active fermentation does take a little longer when using pure O2, for the above mentioned reason that more O2 = more yeast growth first, and then fermentation kicks off rather explosively.

I go no more than 60 seconds of pure O2, just enough flow to disturb the surface and cause a little foaming.



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