Thanks - interesting information. I understand the idea that crushing them frozen produces a kind of freeze-distillation effect where some of the pure water (ice) gets left behind, so you concentrate the remainder - and I did shred and crush mine from frozen, which resulted in some water ice...
Thanks for the response - you were right, there's nothing wrong with the apple juice. The cheap Chinese pH meter I used was reporting nonsense, the juice was actually at 3.6pH (once tested with decent quality strips). So, nothing wrong with the acidity.
I tried again with properly rehydrated...
I'm making a batch of ice cider, from apples from my own trees (not shop-bought juice). No preservatives. The constituent apples are early this year, and most of this batch is windfalls; 55% green and 45% red. These have been frozen in a chest freezer, and then shredded and pressed. The batch...