one more thing for your sig... type of surface? vinyl, plaster, fiberglass? Above or in-ground pool? We also assume outdoor. What part of the world do you live. I know...1,000 questions but it all makes a difference to how to manage your pool.
Was is less than 1 ppm or not? i.e. did it take two drops to change to clear, with the third drop making no change? We are sticklers here on this since we have experienced situations where "close enough" ended up being not close enough :|
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