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Bryan,
I think the definitive answer to your question has to come from the manufacturers of Coppersafe. They know what's in their 'soup' and if it would have a reaction/interference with the other chemicals.
There are two questions to ask the manufacturer: Can it be used at the same time and, can the copper still be properly measured in the presence of the other chemicals? The last question may need to be answered by the makers of the test kit.
If and when you get the answers, please let us know the outcome. You have posed a very good set of questions.
Regards,
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