Okay, Aquacraft the company that collected and then provided the samples for these tests is the same company that makes Bio Sea and Marine Environment. The tests are... um.. to say the least, biased...
If you use IO, keep using it, there is no arguing the fact that IO has the cleanest most modern facility of any of the salt manufacturers. I myself use Kent salt and it is IO salt with extra stuff added, it is processed and packaged by IO in their state of the art facility.
I've used Bio Sea, I've used Marine Environment, and other salts... what I didn't like about them was inconsistancies, I like my salt to mix up consistant and niether of the Aqua craft salts were consistant to any degree, I was seeing pH of almost 9 in one batch and 7.5 in another, I was also very dismayed to find Ca levels around 200ppt, and alk levels around 4 dKH.
The kent salt has been very good to me, but if you use IO now, and are happy with it, keep using it.
Don't change salts because MDP says his are better, change salts if you don't like yours... btw, IO is one of the most commonly used salt, if it really isn't that good, why do people use it?
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