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Is there a mimimum percentage of the total capacity of a fermenter that should be full when brewing? would it be okay to make a small brew only utilizing 30% of the total capacity? I've read that yeast diplicates until there is no more available oxygen, would this affect the brew negatively...

What would happen if i added activated carbon in with the mix in the fermenter during primary fermentation? has anyone done this? what were the results? I'm hoping this will filter the brew, making a crisper finish, and filter our some nasties? thanks for your help.