Pre bought juice does save you a bit of work! Most apple juice made for drinking is made from low tannin apples so your addition of the crab apples sould balance your cider our nicely, plus the Grannys will add quite a bit of acid as well.
I don't have a press, I just use a bench top juicer...
G'day,
I undertook my annual cider pressing about three weeks ago. My apple bill consisted of:
3.5kg of crab apples
10kg of Granny Smith
36kg of Jonathan
This gave me 22l of juice. This year was the first time I have added crabs and the results were fantastic. Nice, tart and plenty of...