Ask Mr. Wizard

Lagering with Airlocks

TroubleShooting

Clint Fisher - Adelaide, South Australia asks,
Q

When cold crashing or lagering beer from a relatively warmer temperature to a colder one, negative pressure of condensed air in the headspace can draw in liquid and air through the airlock or blow-off tube. Is this a concern, and how can it best be avoided?

A

Protecting against airlock suck back, bottling highly carbonated beer and homegrown hop quality.

Response by Ashton Lewis.