I am about to pull the trigger on a craigslist find. The ad claims a 7 gal and 5 gal carboy for winemaking. I assume the carboy on the left is the 7gal. Would this shape be ok for a primary? I'm concerned the shape might shoot krausen out the top. I am also concerned that the surface of the liquid will be greater due to the shape and increase the chances of oxygenation.
Sure. That would work fine for beer. The 7 gal would be perfect for a primary, and the 5 gal is a perfect secondary. During primary fermentation, almost all of the oxygen is purged from the headspace, so it's not a worry. BTW, wine is MUCH more succeptable to oxygenation than beer, so if it's good for wine, it's probably good for beer.
"Wine" equipment for beer brewing?
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