I do agree with your advice regarding the zapper. Dr. Clark strongly advises using a zapper. She also strongly is in favor of many liver flushes. She says flush until you see no more stones.
She has an order in which to do the cleanses and I think we would ALL be better off completing these cleanses/flushes in that order.
However, if a Liver Flush does not work the first time, it does NOT mean you should not try it again. There are a lot of factors that go into a liver flush.