Quote Originally Posted by aquarium
So, the entire residential pool chemical industry has organized itself for intentional failure since 1974? Why haven't there been huge class action lawsuits against the obvious deep pockets, like, oh say, DuPont?
I was partly being facetious when I said the CYA manufacturers "intentionally" ignored these results. I have no evidence that they saw these results back when it was discovered though I do know that at least one company (whom I've had contact with) knew about it since 2004 (see pages 15-17 of EPA Document). I do not want to cast dispersions on these companies. The guy I communicated with was fairly forthcoming and we did not discuss the historical promotion of CYA products -- I was mostly just trying to solidify the technical data through alternative sources.

Nevertheless, it doesn't take a whole lot of imagination to see that companies that make a product whose excessive use can lead to problems would not be the first ones to say "limit your use of our product", especially since this mostly just leads to people buying highly profitable specialty products (algaecide, non-chlorine shock, etc.) to fix the resultant pool problems. Technically, you could just keep ramping up your (FC) chlorine levels to higher and higher amounts to still reamin "safe", though you would be losing an awful lot of chlorine doing so (since even the chlorine tied up in CYA degrades in sunlight, albeit more slowly with a half-life in direct intense sunlight of around 8 hours).

I don't want to start a crusade on this issue, especially since it seems that the manufacturers are now starting to disseminate the advice of keeping CYA levels in check.

Richard