Excluding bacteria that can eat malic acid and turn it into lactic acid is the only way to make sure you don’t get refermentation in the bottle.
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If you add some kind of sweetener that is fermentable (table sugar, grape concentrate, maple syrup, honey, etc.) you risk an uncontrolled re-fermentation in the bottle, which is never fun.
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Brettanomyces is often an ambient microbe in the air we breathe, but that’s no reason to go inviting concentrated and healthy stocks of it into your cellar.