That type of filter will remove almost none of the yeast solids (but will strip out the corn). UJSM (especially the first run or 2), can handle a little extra time IF kept under air lock.
When I run mine, it is on about a 1 week cycle (with 2 batches going). I do 3 days or so in primary, then siphon off into a carboy, add cooled backset and fire up the primary again. The carboy will sit for 3 days or so (to clear some), then into the still. When I drop that into the still I wash the yeast dregs, and put the new 3 day old primary into the carboy (and restart the primary). Then strip distill, and cycle again.
Thus, I have 2 runs going in tandom, and both get about a week of time to do their magic. The final wash is done fairly well, and somewhat clear (not perfectly clear, but 80% clear).
That is just my method, others can certainly do things differently, and still have great results. With this sour mash method, it really is hard to screw it up.
H.

