I have been recommending just using water with no abrasive for a number of years. A low bisque makes the smoothing go quickly.  Polishing after high fire works fine, might be a little slower without the final polishing compound.
But, there are no contaminants in the slurry to worry about contaminating reclaim.

Bryan Johnson

 Bryan, try only water in the bisque. I cannot say what will happen after the 2 nd fire if you only use water, but in the bisque the clay is soft , but abrasive enough to smooth itself. I keep the bisque powder. It is a natural  grog.