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if you do open ferment you would scoop out some braun hefe to simulate the O2 ingress of the reall thing and also get the dead and dying yeast out of your wort which you don't want to do with a heffenwiezen since you are going for the yeast estersNo, BIAB certainly doesn’t mean I cannot decoct, my laziness does.I’ll take your word for it that Melanoidin replaces the need for it anyway. Check.
My reasoning for open fermentation is to reduce the pressure buildup on the yeast which *might* allow for more yeast flavors to develop. I have no idea if this is true but it’s what I’ve read. I ferment all of my Farmhouse/Saisons with just the blowoff run into the sink. No liquid is necessary. It’s more of a pseudo open fermentation. If my fermenter had more headspace, I would just cover it with a piece of foil for a few days. Not sure either way makes a difference since they are technically not closed. Once fermentation begins to slow, that’s when I’ll close up with an airlock.
I believe in theory anyway


