That's an eye opener Randy, I assume you mean they add it to limit adsorbiton by ployfilters to the 40ppb level or is it more of a concern than that? Do you think it will release free copper to an aquarium?
FWIW, I run small amounts some polyfilter and cuprisorb continuously without any noticeable ill effects over the years;perhaps I should stop.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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