You don’t need to grind salt. You grind pepper because it has volatile oils.
Redmond gets salt from Utah Salt Mines. They are good.
http://www.vitacost.com/redmond-realsalt-kosher-salt
I was going to recommend Redmond from Utah, as well...
Here: http://www.onedegreeorganics.com/realsalt
All the trace minerals without the man-made toxins...Comes from ancient dried up sea beds before that bad stuff was present in sea water...
And...Fron the good ol’ USA...