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-   -   Airlock on Secondary fermentation has started bubbling (http://www.homebrewtalk.com/f37/airlock-secondary-fermentation-has-started-bubbling-208949/)

HeavyHandedBrewing 11-30-2010 12:19 PM

Airlock on Secondary fermentation has started bubbling
I transferred my x-mas wheat to the secondary fermentor on Saturday. In the primary, the fermentation was normal; it started after about 24 hours, when for 5 or 6 days, then I let it sit for 7 days with no activity. I donít usually use a secondary, but I used several ounces of spices in the batch and wanted to make sure I had left all of the solids behind. The airlock has been bubbling about once every five seconds for the last 48 hours. Any ideas on why this happened? Was it a stalled fermentation that got jumpstarted when I transferred it? I did not take a hydrometer reading when I transferred it because I usually due that once right before I pitch the yeast, then right before I bottle it.

Revvy 11-30-2010 12:33 PM

Airlock bubbling and fermentation are not the same thing. You have to separate that from your mindset. Airlock bubbling can be a sign of fermentation, but not a good one, because the airlock will often blip or not blip for various other reasons...so it is a tenuous connection at best.

If your airlock was bubbling and stopped---It doesn't mean fermentation has stopped.

If you airlock isn't bubbling, it doesn't mean your fermentation hasn't started....

If your airlock starts bubbling, it really doesn't matter.

If your airlock NEVER bubbles, it doesn't mean anything is wrong or right.

Your airlock is not a fermentation gauge, it is a VALVE to release excess co2. If it bubbles it is because it needs to, if it doesn't, it just means it doesn't need too...

Often an airlock will bubble if the fermenter has been disturbed in some way, like a change in temperature, change in atmospheric pressure, the cat brushing against it, opening it up to take a hydro reading, or in your case it could simply be offgassing because you moved it to secondary.

The co2 has sat in stasis for a period of time, then it was disturbed so it is not longer at equilibrium with everything else now. And therefore it is blipping in your airlock...

Or you could indeed have fermentation happening, since maybe your fermentation was laggy and racking it over restarted fermentation.

Airlock bubbling only tells you that co2 is coming out of the airlock, it is not telling you why. And there's various reasons. That's why it's not a good idea to equate airlock bubbling with fermentation...It could be because it is fermenting, or it could not be because of fermentation...so it's not a trustworthy tool.

Either way I wouldn't worry about it.

HeavyHandedBrewing 11-30-2010 01:26 PM

Thank you Revvy for the detailed explanation. I guess I have always associated (in error) the bubbling airlock with co2 release caused by fermentation. You have corrected a misconception that I have had for a while now.

cappy 11-30-2010 03:48 PM

+1 what Revvy said!

dannylerch 01-24-2013 08:57 AM

trust your hydrometer brother, it's the only way to be sure. :-)

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