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Many thanks for the quick and detailed reply. I recognize the error in my ways... the algaecide treatment was initiated before I followed instructions on this site. The Algaezone Plus used is EPA Reg No 8959-2-4217, with ingredient/concentration you list above (51.4% copper ethanolamine...

Hello - I have a stain on the plaster walls of my pool that extend about 2.5 feet underwater from surface and then stops; there is a visible horizontal line around pool at that depth, below which there is no stain (see attached picture). I'm not sure whether this is a metal-type stain or an...