I had this happen this morning. Brewed in APA with a second generation Omega West Coast Ale. I made a starter the day before and by the time I pitched, a little head of krausen began to form on my starter. Pitched the starter at about 5pm and by 9am on Sunday, I have activity. Didnt look again until about 7am today (Tuesday). I opened the basement door and could smell the fruity esters had saturated my basement. Who else loves that? Whats great is my fermenter is on the other side of the basement, so the whole place smelled great.
I took a look at the carboy and for the first time ever, foam had overtaken my air lock, foam started to push itself out of the neck of the carboy and the bung, foam was coming out of the cap on the air lock. Is there any chance that stuff gets sucked back in? i only had tap in the airlock.
ANyway, I guess I cleaned that yeast pretty well and that starter sure worked. I checked the temp and it was 68* in the basement. Just a tad higher than I wanted. I closed the vent closest to my fermenter, ripped off the air lock, got a little blow back from the pressure beneath
threw on a blow off and went upstairs to clean the airlock. I realized about 2 minutes later that I didnt sanitize the bung or tube after having just washed it.
Ran downstairs, took note on how good things smelled again
Unplugged it, sprayed it, and fit it back on. I am a little nervous about the tap water and that I didnt sanitize the bottom of that bung, b/c when I took it off there was deep boom as the pressure had built up alreay. I sprayed it down, (and all the krausen which had already fixed itself onto the bung started to drip)
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I should be fine, as everything was clean to begin with. I guess I wont know anything for another 6 weeks
.. Anyway, the tube is beneath the fermenter in a glass half way filled with sanitizer. Beautiful work.