The large batch was weak – possibly due to a small SCOBY. For the large batch we pureed 1 1/2 personal organic ‘seedless’ watermelons. Seeds were removed before it was pureed. We used 1/3 cup of watermelon, 1 Tbspn sugar and produced 13 bottles
The medium batch was stronger than the large, we used 1/2 Tbspn and made 10 bottles.
Removed the watermelon late at 2.5 days and it was explosive.