Blow off tube

Alright so I made a blow off and it's working great but I had some questions.

So the krausen is coming through the blow off which I would assume is normal but is some times a small amount a liquid makes it's way into the tube.

The blow off tube isn't submerged within the fermenter or anything. So I'm just wondering what is this liquid making it's way through? I kinda assume it's normal but I'm more curious about the matter

There's gonna be some junk.


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That little bit of liquid is your wort/beer that's been pushed through the tube via active fermentation. This is to be expected.

The whole point of having a blow-off tube is to depressurize a fermenter that has a wort or yeast that results in > 100% attenuation per volume of the vessel. By that, I mean, if your yeast and/or wort are brewed such that they will foam up MORE than 100% of your fermenter's volume, you NEED a blow-off tube, or you'll explode your fermenter.

Historically, US-05, no matter how many fermentables you add, does not need a blow-off tube. Higher-gravity beers using S-04, T-58, T-33, Nottingham, and other English/Belgian yeasts generally require one.

Posting from experience.

Foam = liquid