I put 3 pounds of the Walmart (HTH brand) CYA in our pool which was supposed to add 25ppm per the BleachCalc. I'd already used two 3" pucks, which added about 5ppm CYA. So the -calculated- amount of CYA added was 30ppm. Walmart (HTH brand) 6-way test kit two weeks later said zero CYA. Pool store test said 40ppm CYA. I think the HTH test for CYA is not accurate. Either that, or their CYA is not the real deal.
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