Depends on how "old" they are and how you treat them to prepare them for the flush. I did a lot of preparation to make sure it goes smooth, melt them so they shape for easier passage and get smaller. Of course it depends of the composition as well. I got a bit concerned (panic/disapointment attack) when i first red the doubt about "olive oil" theory, but have had it confirmed by severaly highly trusted sources those really are liver stones . So need to worry my friend, you are indeed passing stones as well :-)