The main point of doing the prep for the Liver Flush is to stimulate the liver function. Pectin increases the amount of bile that is expelled in your stools and therefore forces the liver to increase the amount of bile it produces.Peas, green beans, sweet potatoes and tomatoes are a good source of pectin. I do not subscribe to the idea that malic acid is effective.
A reason why you are not seeing stones may be because your environment in your ileum is more acid than it use to be so that the bile doesn't precipitate into stones.