I brewed my fifth all-grain beer Thursday. Pitched the yeast at 9pm and had bubbling by morning.
Yesterday (Saturday) I heard a whistling sound: it was the air-lock. Some bubbles formed around the black plastic ring and there was a lot of beer in the air lock. I have a 7 gal bucket and this brew filled to the 5.5 gal mark. It was bubbling like a machine gun at this point and the top of the bucket was swollen. I called a friend for advice because beer was escaping. He recommended removing the air lock for a few minutes.
I removed the airlock (relieving lots of pressure) and cleaned it. As soon as I re-attached, it started bubbling like mad again. I moved my primary to the kitchen sink "just in case".
Last night (Saturday night) the lid exploded off and shot beer all over my kitchen. I do not know how long it sat in the sink without a lid. I cleaned the lid and airlock (which was, again, full of beer) and re-attached. It is machine-gun bubbling again already.
Will the open-air have harmed my witches brew? Any tips for reducing bucket explosions?
This is the second time I have made this beer, but I perfected a new mash technique which apparently worked. I have never had this problem before.
Edit: The fermenting temp has been 68F so far.