My cider has been going for a month and I am not sure whether to move them to bottles yet or not.
I was advised that slower fermentation leads to better cider, to I have had them in the garage for the last week and a half. Since moving to the colder environment, the gravity has moved from 1034 - 1022 on one demijohn, and 1020 to 1015 on another. Neither has completely dropped out.
It seems to me that I want a slightly lower gravity before bottle to avoid exploding, but I'm very new to this and may be totally wrong.
Is there a cast iron rule I can follow? How can I tell when should I bottle?