They can test all they want, but if your salt is giving you the results your looking for and have not had any issues then it don't matter much. I have used Reef Crystals and Tropic Marin, Oceanic, IO, and Red Sea Pro all of which gave me results but I have stuck with Red Sea Pro just because of the tests I have done over batch to batch of new mixed water to 1.026 and all have been around proper parameters without having to add any supplements to make up for deficiencies. But like I said if what you are using is working and you tank is doing great it don't matter what the test results are, why fix it if it ain't broke? I am always leery of these types of test because we on the demand side never know if it was done to push a specific product or done in the manner of open transparency. I find it hard to think that a company would spend the cash just to test some salt and spend capital just because some folks on a reef forum wanted it done. Now if was an independent test for results to show only and specifically the differences between salts so the manufacturers can make the products better and closer to natural ocean parameters then that is one thing but how are the people who do the test going to recoup the capital spent?......Someone paid for it for sure but who? and what was their point of doing so? I would be more impressed if it was done or requested by the National Public Aquarium Association for the purposes of them finding out what would be best to use in their public displays. But as we know there are some that use IO specifically and we can see the results they get with it. Of course they have huge equipment as well and I'm sure add supplements to the water as well. So in the end will these test really change anything?
Nope proabably not....