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dharsh

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Re:Question on aeration - 2009/04/28 19:13 Ed is dead on about the efficiency of pouring from bucket to bucket. However, you can get a higher dissolved oxygen content if you use pure oxygen - either from a compressed gas cylinder or from the little tanks you can buy at hardware stores. But then you have the cost of your airstone and gas cylinders.

Another method for using air is drilling a few holes in the line about a foot before it discharges into the carboy. The flowing fluid will create a vacuum and air will be sucked into the moving wort as it flows through the line. Probably not as efficient as pouring back and forth eight times, but easier on your back.

Just for the record, I use the air stone and pure oxygen - another brewer that succumbed to progress! Is the beer better than before? In all honesty, I'm not sure, but I'll admit to picking up the air stone at a club swap meet several years ago so my out of pocket was pretty small. Arthur: What's so bad about being drunk?
Ford: Ask a glass of water.

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rsnyder

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Re:Question on aeration - 2009/05/15 20:40 I disagree with the comment about over oxygenating. if you left the stone bubbling for 30 minutes you may have an issue, but of course by then half of your beer would have overflowed onto the carpet in the form of foam

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bobmasters
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Re:Question on aeration - 2009/05/29 03:19 I don't know Ray, if you are referring to using pure O2, I have always heard you can over do it (negatively affect fermentation) by using too much. I saw a formula somewhere based on OG that seemed to put most ales in the 30-60 seconds of O2 range. Sorry I don't have a reference. Of course if you are blowing pure oxygen into 5 or 10 gallons for 30 minutes you are burning a hole in your pocket if nothing else.

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dharsh

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Re:Question on aeration - 2009/06/07 14:33 Rereading this thread, I have addtional thoughts (!):

• My recollection of Fix's work said that you reached saturation by pouring the beer back and forth between buckets, not necessarily that you reached an optimum. I tried this pouring water between beakers with about 500 ml water and I got up to 7 ppm after five pours!

• You can't increase the oxygen level beyond the equilibrium with whatever gas you use. With air, that means ~7.5 ppm O2, with pure oxygen you can reach about ~38 ppm. I don't remember any studies about how long it takes for an airstone bubbler.... I just run mine until there is a couple inches of foam at the top. Takes 2-3 minutes usually. I don't time it. Arthur: What's so bad about being drunk?
Ford: Ask a glass of water.

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