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Hi all, I've searched the "Is dry acid ok in spa?" question posed. It seems like the regular advice is avoid dry acid due to the resulting sulphates in the water being harsh on metals and potential for calcium sulphate scale building... But then I came across an adamant stance in this post that...

Hi all, I've been using the "Chlormaker" SWCG for a couple of months now and it's been awesome. Absolutely no issues. With my size spa--smallish at 285 g--"setting 3" has been rock steady at 2.5-3 ppm FC; and "setting 4" puts it always at 4-5ppm. My CYA is 30, as calculated by dichlor...