Fermentation explosion Help!

So, yesterday I brewed a Marzen style beer. We usually put our lagers into a carboy because unlike the buckets the carboy can fit in my lagering fridge. I guess this type of yeast is more active that previously used yeast strains or something because this is what I woke up to:



Now i'm not sure what to do. I can try and clean off the top and put a blow off tube up there, although it seems like it will just try and clog the blow off tube as well. Is open fermentation at all safe? This is a beer that is going to take at least 8 weeks to complete, I don't want to put a lot of time into it if it's doomed. Any advice would be much appreciated.

unionrdr said:

I'd put a blow on it asap. But with all that krausen & resulting CO2,I don't think an infection would stand anymore chance than a snowball in hell.

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Agreed. Definitely wouldn't do an open fermentation for 8 weeks.

Well, i was thinking an open for a day or 2 until fermentation dies down and I feel it's safe to put something on. I think i'll put a blow off tube on it but check it hourly for clogs.

Awesome. Yeah, the blow off seems to be working. The yeast is kinda working it's way up into the tube but it's not clogging it. Thanks for the info guys!

Looks like I need to bite the bullet and invest in a lagering fridge that can actually hold a larger vessel.