Julia Chang's flush is without ES http://www.sensiblehealth.com
People like me would not think of not using ES since my calcified stone is 24 mm, much bigger than the ducts and need the relaxing of the ducts.
A less strong possibility is maganesium citrate. ES is magnesium sulfate.
This information is in Andreas Moritz book Timeless Secrets etc. http://www.ener-chi.com
I always wonder how important ES is if you just clean the liver and have no symptoms of gallbladder problems. I don't have read an answer for this.
Andreas strongly believes you should do a colonic with 2-3 days after the flush so no stones get stuck in the colon, but most people don't have the money or a facility close by.
I use Oxypowder before and after the flush, so my intestines are pretty clean.