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If it' relatively fine ground copper sulfate crystals, NOT ROCKS and NOT FINE POWDER 1 cup of copper sulfate fine crystal should weigh approximately .7 US pounds. that number should be good enough to calculate copper sulfate to be used to treat a cesspool but not close enough to calculate chemical reactions. A 300 gallon cesspool requires 3 pounds of copper sulfate twice a year to keep tree roots from growing.

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Webster Gutkowski

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3y ago

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Q: How many cups of copper sulfate equal a pound?
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