37 flushes and you are still counting? I've probably done that many but I stopped counting a long time ago. I had one run of flushes (4) where I got nothing - not a flake, not a speck. 5th one after that, back to an average output. Didn't do anything different before or after. (That, in itself, might have significance to the sceptics who say that the "stones" are the results of the OO. You would expect the same protocol to give the same results, under those circumstances)