after a negative ultrasound and liver/gall bladder function test, i have done 4 flushes to date. each time has produced stones, in fact, each successive flush has been more productive than the last.the first produced mainly chaff. the last, the great majority of stones were greater than green beans in size(forgive my size comparison to food) Each has produced between 1/4 and 1/2 CUPS of stones. Yes this is after a negative ultrasound. I am not saying my results are typical, it is just my experience.