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Would not have been much more than 2% concentration.
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Cather, please define "2% concentration" ... if it's anywhere near what I think, it answers why you had the problems.
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As I said, you only need a 1ppm concentration at most (i.e. 1mg of pure CuSO4 per liter) To give a rough idea, 1/4 teaspoon is 1 GRAM of powder form, slightly over 1.5 grams of "snow" form (grains that are shaped like rice, but smaller). That means 1/4 teaspoon of pure powder is enough to treat 1000 liters of water (yes, one-thousand).
Marci - obviously the ACBlue is a no-go (10% sulphuric acid, YUCK!)