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The Taylor calcium drop test shows a level of 120ppm in my saltwater pool, but I seem to have scaling on my marble tiles. I scraped some off and put it in HCl, where it fizzled, which I am assuming means it is calcium. Would it be possible to have calcium scale with a ppm of 120 or could it be...

I saw an old thread about shipping test kits overseas, but I need some updated information. I could not find a company that would ship directly to me so I bought the Taylor K2006 on Amazon and had it sent to my brother in Florida. Does anyone know the best way to get it to me here in Thailand?

I have been struggling to get control of the pH in my pool that is tiled with marble and has a large, 4 m overflow to a gutter below. I have been adding HCl every few days to keep it within range, but I am wondering if the large exposure to oxygen from the overflow might be increasing the pH...