I would think of taking Gold coin grass, as prep. for the Liver Flush (I would prob. just take the olive oil and grapefruit juice mix you make yourself),and I'd be drinking lots of real apple juice or taking malic acid for several days before. Both of these will soften and make stones smaller.
Julia Chang (google her) sells gold coin grass tincture.
Chanca Piedra also might be good. It means "stone breaker".
(for harder stones, I take it)