Roan... I've been over that thread, it is a good discussion. Frankly, I don't agree with it entirely however. The primary argument in that thread is about it's toxicity at low saturation, which personally I see no problem with in low concentrations. However, do you ever hear of anyone using table salt for a brackish setup? Anyone care to experiment?
Iodized salts/table salts are not recommended in the aquaculture industry, actually it is strongly advised against. For every name you can throw at me that suggest there is no harm in such, I can throw a dozen aquaculture articles and college aquaculture reports that state the contrary.
Here is a clip from an article written on parasite treatments including ich, entitled:
Parasites in Paradise. Submitted for your approval; written by Dee Montgomery and James Brock, D.V.M. from the Hawaii State Aquaculture Development Program and Clyde S. Tamaru, Ph.D. with the Sea Grant Extension Service at the University of Hawaii...
"The salt should be non-iodized and should not contain yellow prussiate of soda (YPS), because prussic acid is toxic to fish."
Please note, I am not stating that all table salts contain YPS, on average this is not always the anti-caking compound used. However, what I do feel is anything above and beyond pure sodium chloride (aside from any minerals normally attributed with salt) is unnecessary and in my humble opinion, a pollutant however small the quantity, to your home aquaria.
Pure solar salts or "kiln-dried" salts (not the pellitized types with anti-caking agents) are what we use in the fishroom at That Fish Place for treatment and brackish setups, it's a heck of a lot cheaper too. This is the standard salt used in the aquaculture industry.
As per your comment on the solar salts used in potable water softener systems... if I may, I ask if you would consider reading up on it.