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In very hard water it is difficult to use copper sulfate because it binds with the calcium, precipitates out of solution, and renders the copper ineffective as an algaecide. (window.AmazonUIPageJS ? Sanco Industries KoiWorx Blue Dye - Ornamental and Decorative Pond Dye, Water Featu... Copper (II) Sulfate Solution, 1M, 500mL - The Curated Chemical Collection. #shippingMessageInsideBuyBox_feature_div>.a-letter-space{display:none!important}#shippingMessageInsideBuyBox_feature_div>.a-section{display:inline!important} LawnStar Chelated Liquid Iron (32 OZ) for Plants - Multi-Purpose, Suitable for Lawn... 0.02% Aqueous Phenol Red Solution, 100mL - The Curated Chemical Collection, Potassium Dichromate 0.100 Normal Quart (950 mL). 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