One more addition to the post above that I'll give so others can undrstand one reason why they are not seeing anything, but probably definitely ARE expelling something from their livers during a flush.
I've done about 108 liver flushes in the last 28 months. There were times down here at the end of it that I didn't see any stones come out of my liver, but could feel something in my liver that needed to come out that my liver couldn't expel on it's own. I did a liver flush last night. I didn't see anything, but the smell was bad. Stuff is still coming from the rest of my body and lymph system and ending up in the liver, so it needs to be flushed out. I think the percentage of parasites that come out that we can't see is about 90%. All that comes out of our livers making us sick is not visible. BUT. . . we are getting it out by liver flushing. So, if you don't see comething visible evey time, don't think your liver flushes are not productive.
Of course, the other thing that we need to consider is that we are clean and don't need to do anything but the maintenance liver flushes like 4x a year.