That guy on RC is just bitter.
Boomer isn't bitter, he shoots from the hip and tells it like it is. He's a great guy and I've had many chemistry related conversations with him. As I said, it may be good salt, but the #'s they printed on the buckets of salt are impossible.
Chris Brightwell used to work for Kent Marine. I've met him and his is a very knowledgable person. As far as his supplements, calcium is calcium no matter who bottles it. Same for sodium carbonate, magnesium, iodine, etc.