I used Mag Cit. for my first flush. The bottle was 10oz size and the directions on it said to use the whole bottle if you were an adult. So...I divided it into 4 doses of 2.5oz each. I took one dose at the appropriate time. It worked as well as the ES that I took on subsequent flushes. However...I had explosive diarrhea the next morning. If you go to the archives I posted my results then. I did move a lot of stones, though at the time, I did not think what I moved was stones. The Mag Cit tastes a little better than the ES but it is carbonated and the carbonation for me was repulsive. If I used it again, I would probably only use a half bottle. (But I do tend to be sensitive to Mag. so you would probably do best to use the whole thing). Good luck!!