I would test my water and soil before I added Epsom Salts (Magnesium sulfate).
We were taught to use it, and did so, until we learned that our water was already over-high in that. OOPS!
The truth is that we have folks here from all over the U.S., as well as some other countries. "Location, Location, Location" is good advice in gardening, as well as in real estate. What is good in some areas, is wrong in another.
