I was at a Sam's Club a few weeks ago and just pricing the buckets of tabs. I do use them periodically just to raise CYA when needed. They had two types, one $10 more than the other for 40# buckets I believe. Ingredient list looked the same, no mention of copper, but one stated something else on the label and for the life of me I can't remember what. Maybe Multi-Purpose or somethng like that. Some offbeat brand. It's been noted on the forum that HTH is now including copper in their pucks. I suspect this was the difference. Go with the plain tabs. As for the borax and BS it doesn't go bad so stock up if you want to. Other comments, I also use Cal-Hypo periodically as I don't have a high calcium issue. Sometimes it's just more convenient that bleach.
Al
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