Richard;

Very interesting. I've glanced at the spectral absorption data you sent or linked, and it's definitely stuff I want to digest later.

I think this might be something to test, if we work that out. (In fact -- an experimental design for such a test just occurred to me -- I'll email you b4 I forget it.) But for practical purposes, if CYA only provides significant shielding at 80ppm or higher, for forum response purposes, that's probably a complication we don't need to include in posts to general users.

I've been thinking a lot about our conversation the other evening -- thanks for your time -- and am realizing that we are going to need some formal K.I.S.S. rules. There's a balance between oversimplifying and burying someone with more info than they can handle. I don't know where the line is, but we'll need some rules. Both of us err on the side of too much . . . too often.

At the same time, how do you know when additional info becomes too much? I don't know the answer, and I'm sure any answer agreed on will necessarily be arbitrary at points. But, I am sure I want transparency to ALWAYS be part of what we do here. In this case, that would mean that we always make the more complex info accessible, and always acknowledge that there's more complexity than what we address in a given post to a given pool owner.

Ben