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Fermenter explosion

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As to the OP situation: If he is gone too long (as in weeks) then with a pause in fermentation, the Krausen in the airlock COULD, note I said COULD, become a dried out hard blockage. Then a temp rise might cause fermentation to pick back up and cause a blowout.

I would recommend removing it within a week at the latest and run some hot water through the S type airlock to remove the excess. Refill and replace. Then keep an eye on it.
 
In regards to the airlock/blow off discussion, i use the same kind of blow off setup as pictured before (with the 3 piece airlock with a hose shoved onto it), it has worked perfect for quite a few beers, but this weekend i brewed a barleywine and overnight the fermenter blew its top! I guess the fermentation of a beer that will be 12% ABV was just too much for the blow off tube to handle.
 

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