I have done the flush and gotten small and large soft stones. Those you can flush, the hard ones would be impossible. The soft stones are from the liver and not the gall bladder. The cystic duct that connects the gallbladder to the common bile duct is much narrower than the gallbladder itself and that itself does not allow for calcified large stones to be passed out. However, the Liver Cleanses are still very good for your health and overall cholesterol blood levels.