How much to fill airlock

Andreas said:

Hi,
I usually just keep the blow-off tube going, but today I racked into secondary and am using an airlock. I filled it with vodka. This airlock has a little cap with tiny holes in it. Is it safe to keep the cap on it with vodka filled up very high? How high do experienced brewers usually fill their airlocks?
-Andy

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zinn said:

I realized today that I didn't fill the air lock up to the fill line. It's only about halfway between the bottom and the fill-line. Is this a problem? Should I add more or will that disturb things?

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3 Dawg Night said:

Are you using a 3-piece airlock? It should have a little cap that fits over the stem inside. The cap is supposed to sort of float so that the CO2 can escape through the stem and through the holes in the floating cap. Those holes need to be below the level of the liquid so that air can't get back in to the fermenter.



Definitely add some more. You'll likely need to top off your airlock every couple of days. It won't disturb anything.

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