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Old 01-09-2013, 02:59 PM   #1
Jul 2011
Montreal, Quebec
Posts: 500
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I'm currently fermenting two batches of mead, which are in the primary with blowoff tubes. I was away from the house for a month. I did not anticipate the evaporation of water from the jars acting as my airlock, and came home to find the tubes hanging in air (the tips were no longer submerged).

I know that CO2 is heavier than O2, but I'm concerned that due to air circulation, oxygen may have entered the tubes and displaced CO2 from the headspace in my demijohns. I will rack and top-up the mead ASAP as a precaution, just wondering what the likelihood of this having occured is...

Thanks for the input,


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Old 01-09-2013, 04:16 PM   #2
shanecb's Avatar
Mar 2010
Pittsburgh, PA
Posts: 1,298
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There could have been SOME O2 that made it's way up to tube and into the demijohns, but the amount would be so low I wouldn't remotely worry about it. I'm sure I've introduced more O2 than that to batches of beer by pulling the lids of buckets off for tests and I've never had a single issue.
A particular love for ancient, obsolete, or lesser-known style from both the US and abroad.

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