Background-
My company has a client on chemical service only, that is interesting guy, he's 90 years old(yes and still kicking!), services his own pool. But he's very intelligent. He's an engineer by trade, responsible for designing most of California's reservoirs and dams over the last several decades. And he's still sharp as a tack, we can't tell him anything, but only pass along info as a suggestion.
Problem he solved-
His (1960's in ground pool, re-surfaced with fiberglass) pool developed black algae one week. Now, in the pool service industry we have all sorts of black algae treatments, liquids, powders to treat this condition. This is what he used: He goes to the hardware store and in the plumbing section, buys a bottle of Root Killer in the blue flakey powder form. Puts it in the pool and the black algae is wiped clean! With no adverse effects to the pool chemistry or surface.
( http://www.roebic.com/root-killers.shtml )
Huh???
My question to you is, though I realize this is most likely a higher concentration of copper sulphate additive, what do you estimate would be the correct dilution mixture for a set gallon size of pool? Too much can stain and not enough will be ineffective. Ponder this one. I'll be checking back.
