a most mis inform remark. firstly the cholestrol stone has a covering that is not dissolveable by most drug, but the cholestrol could be dissolve by ROwachol leaving behind the covering residue which are much lighter and more difficult to exit the tract.if u take ROWACHOL 3 weeks before the gbf then the chance of seeing the covering sludge coming out with the hard stools will indicate to u that the gbf is indeed a real flush of your gall system. take note that the ROWACHOL dissolution must be carefully done to avoid excessive sludge which could create problems. when the hard stools are formed it carry the sludge out sticking to only one side of the stool.this will be enough prove that the gbf does clear the rubbish out of the gall system. the reason why the sludge sticks to only one side is because the opening, the sphinster of Oddi is the only exit allowing the sludge out to the intestine and the colon and out to the world.traditions are no very scientific,but it is true because the body feel relief,and pain free too.good luck.