One thing the study did not metion as to the table salt, IIRC, you do NOT want Iodized. Again IIRC, Iodine is perhaps toxic. Better safe than sorry!
Yes I've been told that too. I had one fish farmer say to also make sure you don't get salt that has sodium ferrocyanide (yellow prussate) added. However I've only seen that farm feed bags -- not table salt.