I don't know for sure Marci. Water Wetter is slightly alkaline and so you will precipitate out Cu(OH)2 if the copper sulfate levels get too high. I doubt anyone is adding anywhere near that much though (it comes from a dilute solution to start with correct?). So most likely no problem there. I'd have to look up the copper silicate stability constants but my guess is that they'd be ok.
The big potential issue is complexation with organics in the other additives. I don't have any idea what organic acids are in those additives. Even the additive that colors them may react with copper to make a copper-organic acid complex that will keep copper from being effective as a biocide. This is what happens to copper in the environment (which is good because Cu2+ is so toxic to aquatic life):
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