I've been both on my back and on my right side and I didn't notice any difference in what came out.
My first three flushes were done per Hulda Clark . I did the zapping and the anti-parasitics. I tried three or four different anti-parasitics, they all made me ill, but I did manage to get some small rice looking things out. I also got sick a day or two after using her protocol. You need clean your colon out two to three days after the flush to get out any remaining stones.