I always use apple juice for 6 days. For the last 4 flushes I have used gold coin grass as well and have taken a longer preparation period. I suspected that I had larger clustered stones (I passed one...looked like a blackberry) and wanted to use something which would break these down. The addition of gold coin grass really did get things moving from the liver, but not as many stones as I had hoped. I probably will continue to use it for another flush or two.
Gold coin grass is helpful for breaking up calcified stones (if you know that you have them) as well.