What kind of salt

[Aquattro]

Originally Posted by Eb0la11

I find it weird that a fish store uses it exclusively with really nice results but there are these problems.

Lots of fish stores use lots of different salts with really nice results. Regardless of salt you choose, you'll need to supplement somehow just to accomodate consumption by corals. Ca, alk, and some people are concerned with MG, all get depleted, regardless of what salt you use. Now if your supplementation program (reactor, balling method) can compensate for the lower levels in your change water, it doesn't matter what the salt comes with, for the most part.
Example. I used IO for years, Ca about 360 out of the bucket. My tank was constant at about 430ppm Ca. I change 10% with a water change, my Ca drops to maybe 420ish. Still well within acceptable range, and my reactor compensates and raises the tank back to 430 in a day or two. So monitor the levels that are important to you, and figure out the trend of your tank. If your reactor/balling/dosing regime handles the difference, you don't need to worry about what is in the bucket, other than a quality salt.
To keep a nice tank does not mean having to complicate things, keep it simple, watch how the tank reacts, and adjust technique accordingly.