I use the 8 gallon ones for 5 gallon batches, no problem.
My problem is that a 5 gallon batch only fills half way up the 8 gallon one and after much pondering I wonder how much of those aroma compounds off gas into that space.
This Brulosopher exp made me think about it even more:
http://brulosophy.com/2017/03/13/th...pace-during-fermentation-exbeeriment-results/
I've considered that too, but what's the difference of having a full fermenter and off gassing out the blow off tube? I just see it as an opportunity to up the batch size a little.
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