Glass weights are needed to keep the ferment below the brine level, but they also can be used for displacement.If you make a small batch of something that does not fill up the jar, you can simply use extra fermentation weights to occupy the void left in the top of the jar.Since a small ferment will only off gas a small amount, this practise fills the extra space with glass, leaving only a small amount of oxygen remaining to be displaced by your ferment.
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