When I started flushing my US said, inflammation/thickened wall 42 mm/stone in gallbladder neck. After flushing several months and getting out green stones and sludge, the US said inflammation gone/wall back to normal 3mm and the stone was now free floating. I have to assume because the stone is now free floating the bile could pass again.
I do now a flush every 2 months or so to keep everything flowing. I was green stone free for awhile, but in my last flush I had some new ones again.