JoeyB wrote:
> ...
> My Question:
>
> Will the preservatives in the apple juice I add be sufficient to
> prevent my cider from further fermentation?

I don't think anyone can say whether or not fermentation will restart.
There are simply too many variables. I'd be very surprised if the
concentration of preservatives in the concentrated juice would be
sufficient to stop a renewed fermentation, once it's thinned out in the
cider.

Your best bet would be to rack your cider and add one crushed campden
tablet for every gallon of cider. Also add sorbate; I rarely use the
prescribed amount because I think it adds a strange taste to the
beverage, but a small addition would be a good idea. Finally, top up
with concentrated juice with or without preservatives.

Give it at least 6 weeks before bottling.

Greg G.