I used these to clean the white residue around my pool. Although they don't last very long, they completely remove plaque. In terms of durability, one stone eliminated the entire length and width of my 30ft x 18ft in-ground pool PLUS the hot tub. Turns out the previous owner had neglected this task for the last year or so so it had accumulated quite a bit. Great product, really works and in my opinion a great thing!
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