A social and/or notice board and is not so much for discussing Grahams work, or related topics as covered by the other boards, but more like a place where people can share other things.
I have a suggestion. Are you familiar with coolant paper filtering systems for filtering out grinding swarf from production grinding of precision metal parts. Perhaps you could flush the sands over the paper element trapping the ultras in the paper and later back flush the ultras out. You may have use several grades of paper elements. Try it. Paper elements are available through industrial supply companies dealing with coolants and filters.