As noted in that thread on the other forum you are referring to, his arguments to the points waterbear made are ridiculous. He is in Canada so the EPA registration doesn't apply -- but what does that have to do with efficacy of copper sulfate? It doesn't pass EPA DIS/TSS-12 in the U.S. and I write more about kill times in this post and I write more about sanitizer and disinfectant registration in Canada below.
He claims it is not slow-acting because copper sulfate is not the only ingredient in this powdered chemical. I cannot find "Seapool" as a brand on the Internet -- if the guy can provide a link to where it is sold, I might be able to dig up an MSDS equivalent -- or he can just read the ingredients on the bottle. Disinfectants and sanitizers ARE regulated in Canada as described in this link. As seen here, Seapool is NOT a registered pesticide product though there are many other algaecide products registered using copper sulphate. There are also registered swimming pool bactericides such as products containing calcium hypochlorite (Cal-Hypo), sodium hypochlorite, trichloro-s-triazinetrione (Trichlor), sodium dichloro-s-triazinetrione (Dichlor). See if he can provide you with a Health Canada Pesticide Registration Number.
His response to point #3 is that "copper isn't just used as an algaecide, it is also used as a pH balancer" shows that he doesn't understand chemistry as that is absolutely not true. Copper does not balance pH, period.
In his response to point 4 he says that "in high concentrations copper can turn your hair green", but then says that "in Seapool it the ppm is an ammount close to 10-15 ppm" which would certainly stain since normal copper concentration in a pool to prevent algae is in the 0.3 to 0.7 range and anything higher is certainly going to stain unless the pH is kept very low (7.0 or lower).
Good luck with your arguing with this person.
Richard
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