I've also done about 8 flushes over a period of four years, and gotten very mixed results. Only twice did I get out a LOT of stones, the other times usually at least a few but some were ZEROes, which is so disappointing. I have used chanca beforehand for a week or more on some of them and I think those were the times I saw nothing coming out, not stones nor sludge, just poop. My best results were when I had had dandelion juice and silymarin a few times in the week preceding the flushes, but also when I used more malic acid and stuck to the apples every day, sometimes quite a few per day. BUT also when I had been eating rather badly in the preceding months--especially once when I ate about four cheesecakes in two months! I do find chanca really helpful when I get gallbladder pains, it always works.