I did 2 flushes. The first flush got out a ton of stones and 2nd flush was hardly anything, only about 30 rice size stones. I definitely got the bulk of them out on the first flush. Since my diet is much better and exercising daily, I will probably flush once every 3 - 4 months from now on. My doctor wasn't aware of it. I changed PCP doctor since my first test back in April of 2002. Therefore, my new PCP doctor didn't know that I had high cholesterol prior and my old PCP doctor doesn't know that my cholesterol is now lower.