Gall stones from flushes have been analyzed and have the same composition as the stones found in surgically removed gallbladders. There are several older threads on this subject. There are several reasons why a person won't pass Gallstones in the flush. If stones are cleared out of the gallbladder it may take two weeks of more for the stones in the small bile ducts in the liver to collect in the gallbladder. Bile sludge can enmesh the stones in the gallbladder and until the sludge is broken up the stones won't come out. A person might not have enough bile in the bile pool to force the stones out. parasites in the bile tubes in the liver could be blocking stones from moving down to the gallbladder.