The liver-flush survey indicates that 44.7% of flushers report a cure and 65.6% an improvement. There are qualifications to this, for example, some liver-flushers didn't have any problems to start with.
4% have never seen a stone.
62.9% flushes always get something
4% don't look for stones
If your flushing because you have been diagnosed with Gallstones or biliary sludge then stones are very important.