Conspiracy theories aside, I'm going to go out on a limb here and suggest that it's not in AWT's best interests to deliberately favor one salt/company over another regardless of reason. Considering the market they appear to be catering to, it would be permanently detrimental to their reputation, and tantamount to business suicide.
The only thing I'd like to reiterate is a need for a control by testing natural sea water.
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-Chris
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