The second ferment is done in a sealed bottle to allow carbonation to develop.
- During the first ferment the kombucha is able to breathe and all gas produced will escape, your kombucha will be flat.
- The second ferment traps the gas in the kombucha so there are bubbles when you drink it. It is also a chance to add flavours or infusions.
You don't have to do the second ferment, the kombucha is still just as good for you after the first ferment. We recommend a shot of kombucha from day 25 of the first ferment in a glass of sparkling water if you still want the bubble.