I've done 22 LFs, all with Epsom Salts .
I like the simple recipe by Dr. Clark, as it is inexpensive, easy and you can start with that and then tweak it as you get more into it.
I honestly don't think I could have gotten the huge stones (the size of walnuts)
I passed during my 13th LF: I know they could not come out without the Mag Sulfate.
I adjusted the recipe a bit, but the only thing about ES I don't like is I get dehydrated, unless I continue drinking a little water all the way until about 1 hr before the flush: if I don't I get mega headache, and feel v.uncomfortabe.
Another thing I added was to take another dose of OO/GJ between my 2 last doses of ES, but cutting that dose in half (1/4 cup OO (Olive-Oil) + 1/4 cup GJ).
That way it's like doing a second LF, making sure you get all the gunk out.
I like it, because although the flush is easy I find all the preparations a bit much and this way I can wait longer before I do another flush.