Gallstones come down and out the bowel, Kidney gravel goes down and out the urine. It is wise to keep clean of this waste accumulations. Herbs keep the kidneys clean, if you use home made distilled water as a liquid source, you will have very little kidney stone problems and don't forget bladder and prostrate stones as well as pancreas stones.
Stones are bad news, your better staying stone free. Correct diet is the best way and herbs and cleanses are aids.