without knowing your history such as symptoms and dietary habits, it's hard for us to say for sure.
If you've been eating the standard american diet for years and years and suffering from constipation, high cholesterol, muscle and joint pain, migraines, acne, etc. etc., then chances are the stones are too clumped together to pass thru the ducts. in this case you have to dissove them with malic acid/gold coin grass/phosfood/eating and drinking green apple juice. The other problem is some people's livers are so tired and congested that they do not release a lot of bile, so there's never enough pressure to force the stones out of the gallbladder. And the gb can become stiff rather than flexible. etc. etc.
Only by following a very healthy Diet
for the liver and gallbladder, taking the above supplements and other supplements to strengthen the liver, can you have a really excellent flush, if these factors are present.
If they're not, then you're one of the lucky 10%! Congrats! :)