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Well, keep in mind that the requirements for "food grade" are different than what a reefer may require. In the food world, there is a term "acceptable level of filth."
Plastics have quite the potential to leach some materials into water so I'm not surprised by your findings.
What I can offer you is that there is a finite amount of phosphates/by products in the tub. So in theory, over time, you should read less and less phosphate contamination. You can also rinse the walls with a vinegar solution to help remove any residue that remains.
It is as if you have to "cure" your new tub.
HTH
J
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