Re: Zinc sulfate monohydrate and Copper sulfate pentahydrate

Barbara Rosensteel

Thanks Dr. Kellon.   The product is 35.5% zinc with a guaranteed analysis that includes 50 ppm (max) cadmium, 5 ppm (max) lead, and 4,000 ppm (max) iron.   That does not seem very "clean" to me, but perhaps in the small amounts it is given the amount of iron and heavy metals are so small as to be of no concern. 
Barbara Rosensteel

Sept 2007, Cookeville TN














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