Magnesium is indeed a miracle mineral!
I was convinced of this many years ago after
reading a book written by Dr. Sherry Rogers. She
stated that one of the reasons for sudden death heart
attacks was due to a lack of magnesium.
This was stated in the post you referenced:
"Often people who have done a series of flushes find that the ES works less and less with each flush. This is probably because the ES drains magnesium (and other electrolytes)."
Epsom Salt is magnesium...magnesium sulfate.
Dr. Hyman suggests that we bathe in ES. So the
post is stating that magnesium drains magnesium.