There's a previous post I found: //www.curezone.org/forums/m.asp?f=73&i=313
where the guys says that he examined Gallstones that he passed with much pain against the ones passed with the flush. He also says that he found green balls mixed in with real stones.
This article looks at the presence of biliary sludge and cholecystitis/gallstone formation. Maybe the flush gets rid of this sludge, clumping it together, as you say, and this has a helpful effect on the gallbladder.
Hmmm, I'd better stop posting on this site or I'll get fired for goofing off!