Brulosphy test-flushing bottles with CO2 vs direct filling

[Beer-lord]

Interesting experiment.

http://brulosophy.com/2017/06/05/flushi ... t-results/

[BlackDuck]

Very interesting. I am of the opinion (and I'm no scientist with an orbisphere or any other fancy schmancy lab equipment), that there has to be A LOT of oxygen in suspension of the beer when it is being transferred in order for it to make any difference. If you bottle slowly with a picnic tab with a bottling wand on the end, there is very little chance that you will have oxygen mixed into the liquid. You'll push out the oxygen in the bottle with the liquid, and if you let the bottle fill completely to the top with foam and then cap, there will be very little oxygen added to your beer. At least not enough to make a hill of beans that it's going to affect the beer. Sometime I think homebrewers tend to really over analyze many topics and then make an issue out of it when there really is no issue at all. We are not trying to land a man on the moon, we are just making beer.

[John Sand]

I agree with BD. Though I keg, I make little effort to purge oxygen. To sanitize the keg, I put in starsan and push it through with CO2. I am aware that the CO2 mixes with the air in the keg, but some of each departs when vented, leaving a mix that is at least half CO2. The beer then pushes out most of the gas, leaving perhaps a quart of mixed gas. The original air was only 21% oxygen, the remaining gas less than 10%. That makes my beer/oxygen ratio 40+/1 by volume, much much more by mass. And that gas will not all dissolve in the beer. I only ever competed when I bottled. My beer has had plenty of flaws, but no one, neither judge nor homebrewer nor craft beer fan has ever found it oxidized.