I made a batch last year out of Welch's White Grape and Peach that was really a good wine, I thought, to come from frozen concentrate and the juice is so pure, very little sediment. I didn't use any kind of fining on it and it turned out crystal clear. As a matter of fact, I used the same recipe on it that I use on my fresh muscadines, with a little adjustment for S.G. One thing I did find, having made a couple of different batches with the frozen concentrate....sometimes they can take a few days to start fermentation. Could have something to do with preservatives trying to kill the yeast, but that's just a guess on my part. I'm sure many here could comment on that.