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    Evaporative Deposits Immune to Acid

    Apparently a common problem in sunny CA. There are many contractors with bead blasting equipment using #8 and #10 glass beads and marble beads. Prices run $250-$350 including a tile sealer application. I think this problem is for the pros.
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    Evaporative Deposits Immune to Acid

    New to BBB and a definite believer--thanks! I let the pool service manage the chemistry the last two years and things are way out of whack. Just tested Mar 1 and found CYA 99, CH 380, pH 8.2+, TA 170, CSI 1.1. I've drained the pool 70% to reduce CYA and TA and want some advice on this hard...