Originally Posted by whatdoyameanman
This is good advice because I think as I added both at the same time, the new juice is fermenting as there is still bubbles coming up the carboy and gas coming out the airlock.....
What do I do now that this had happened ?
Wait until it ferments out. Then rack off of the sediment once it is clear into the stabilizing mixture of sorbate and campden. Wait a few days, then sweeten.
Sorbate works by inhibiting yeast reproduction. If there is still plenty of yeast in suspension or on the bottom of the fermenter, it won't "work" to stop fermentation from recurring, as there is plenty of yeast in suspension and the yeast don't need to reproduce.
Giving at least a few days before sweetening it is important in my opinion, because adding the sweetener at the same time means the yeast are still viable.