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[APD] Cu levels in PMDD

I'm looking at mixing PMDD for my self. The only Trace Element Mix that I can find localy has relativly hight levels of of Copper (Cu).  All the other minirals are  present in roughly the same ammounts as in CSM, except the copper which is about 10 times more.

At what levels will the copper become a problem ? 

Phillip Grobler
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