is one of the only fining agents that can be added pre-fermentation.
When the turbulence of fermentation begins, Co2 bubbles form in the
must and grab onto the Bentonite lifting
it up to the top of the fermenting must. As the Bentonite
moves up through the fermenting must, it attracts positively charged
solids as it rises. When the Co2 bubbles reach the surface of the
fermenting must they will burst causing the Bentonite
to fall to the bottom of the fermentation vessel collecting dead
yeast and positively charged particles along the way. By the time
you are ready to rack from the primary, the Bentonite will have
gathered a nice sediment of unwanted solids on the bottom. In
addition, Bentonite helps keep wine
stable during fermentation. Because your wine is clarifying during
the entire fermentation process, when adding the final clarifier
before bottling, it will clear much more quickly.