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  1. C

    Vastly different readings

    I hope someone can help me understand this. I have TF-100 test kit. Currently they are about 8 months old. With this set I get TA at 100, CH at 450 (salt pool). I just received a new set of replacements. With the new set, I get TA at 280 and CH at 625. I store my kit in my home in a cabinet...
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