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Old 03-14-2008, 03:32 AM   #1
solidghost
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Default Air Pump question

Shaking the fermenter like mad for 10-15 minutes can be very tiring. I am thinking of getting an air pump to aerate my wort. But is there any other equipment needed other than the pump and the tubing?

I have heard this thing about an air stone, what's the advantage of using a airstone?

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Old 03-14-2008, 03:35 AM   #2
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An airstone will allow the oxygen to saturate faster because it is going through the tiny pores which creates really small bubbles, as opposed to big bubbles. I would highly recomend an inline filter, because air may not be 100% clean. Since only 20% of air is O2 you have to keep the pump going for at least 10 min.

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Old 03-14-2008, 12:33 PM   #3
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I seem to remember reading on here somewhere that it took 50 minutes to reach 80% saturation... Anyone who actually knows care to clear up how long to let the air pump foam up the wort?

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Old 03-14-2008, 01:36 PM   #4
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The aeration system on Morebeer.com recommends the following:

"Because the atmosphere is only about 20% oxygen, the diffusion stone must be left running in the wort for approximately 30-120 minutes (however even 5 minutes of aeration is better than shaking the carboy.) "
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Old 03-14-2008, 10:18 PM   #5
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I normally would not post a link to another brewing forum...however, the green board had a post today...someone got an Oxygen tester, and started doing some comparisons with airpumps vs pure O2 aeration.

pretty interesting stuff too.
http://www.brewboard.com/index.php?showtopic=88898

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Old 03-14-2008, 10:24 PM   #6
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Get a wine degassing wand. Simple and effective.

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Old 03-15-2008, 01:23 AM   #7
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Quote:
Originally Posted by mr x
Get a wine degassing wand. Simple and effective.
Anyone have an account on the green board? I would like to see the guy with the o2 sensor do a comparison of common methods:

Pouring back and forth a few times
stirring with a wisk
shaking carboy
others (these seem to be the ones I have seen the most)
paint stirrer
degassing wand
air pump/aquarium stone
o2 (looks pretty efficient)

Sorry, im an engineer by training.
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Old 03-15-2008, 01:01 PM   #8
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I know that this does not completely answer everything, but Wyeast has some information regarding aeration on their site.

http://www.wyeastlab.com/hb_oxygenation.cfm

This doesn't answer the question of will the O2 ppm go up if aerated longer on regular air w/ stone or if shaken longer. I typically use an aquarium pump w/ stone for 30-40 mins in my carboys before I pitch the yeast, or I will shake the carboy for 5 minutes. I have had acceptable results and usually full attenuation but, am beginning to think about straight O2 to save time and my arms on brewday.

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Old 03-15-2008, 01:42 PM   #9
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Thanks for the link J.B.W.

Their results are fairly surprising... Shaking and splashing for 40 seconds appears to be as effective as an aquarium pump/stone setup for 5 minutes both resulting in 8ppm. I wonder what doubling each method yields... double the ppm? probably not.

I think I will just save some pennies for an o2 regulator and SS stone.

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Old 03-16-2008, 03:10 PM   #10
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Could it also depend on how powerful the pump is?

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