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-   -   Why is the water receding in my airlock? (http://www.homebrewtalk.com/f39/why-water-receding-my-airlock-88838/)

emgesp1 11-15-2008 08:11 AM

Why is the water receding in my airlock?
 
I've been notiching water loss in the airlock.

I filled up the airlock with sanitized water to the line and left it alone, a couple hours in I checked on it and noticed the water was under the line, so I filled it up again, came back and it's under the line again. Nothing is shaking it, so why the water loss?

emgesp1 11-15-2008 08:13 AM

FWIW, primary fermentation has not strated yet.

david_42 11-15-2008 03:04 PM

Either the fermentor's head space is cooling or you have a high-pressure air mass coming in.

Radarbrew 11-15-2008 06:55 PM

Keep the cap on and the cat out of the room, he's drinking it....
But, yeah..the above is actually what I'm going with.

fratermus 11-16-2008 12:40 PM

Quote:

Originally Posted by emgesp1 (Post 956320)
I filled up the airlock with sanitized water to the line and left it alone, a couple hours in I checked on it and noticed the water was under the line

Is this a 3pc (disassembleable) lock? When the primary cools the floating cup in a 3pc gets sucked down to the bottom o fthe lock. Further vacuum will pull the airlock liquid down into the primary. Assuming the liquid is clean and orthodox this should cause no problem.

In situations where negative pressure is suspected (ambient cooliing, container flexing while moving) an S-type bubbler will allow the air to move backwards without sucking the liquid through.

Note that when your primary is outgassing lots of CO2 it is possible to lose liquid out the other end due to evaporation, overflow, splashing, etc. Evaporation is accelerated with volatile liquids like vodka and heavy outgassing as with ApfelWein. Luckily Ed warns us about this in advance.


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