I'm brewing my second batch and had a bit of an accident yesterday. I brewed 20l two days ago and when I checked my fermenter (bucket) yesterday it had overflown. I don't know what possessed me to open the lid and clean in, instead of just cleaning the mess and airlock, but I did. The bucket was open for maybe 10-15mins. I did clean and sanitize both lid and airlock, so hopefully there's no contamination, but I am worried about oxidation. Should I be? When and how will I know if it happened? Is there any way to fix it?

1 Answer 1


It's fine. I assume the beer is still actively fermenting, in which case not only will freshly-produced CO₂ (somewhat) displace the O₂ in the headspace, but the yeast can still clean up any O₂ that does dissolve into the young beer.

Many high-gravity beers actually forcibly inject O₂ during the early stages of fermentation to get a solid ferment.


  • I checked the fridge again last night and it smells amazing, so I think you're right!
    – B. Trapp
    Commented Feb 12, 2016 at 17:20

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