Copper sulfate is used as a herbicide for control of invasive aquatic plants and the roots of plants near pipes containing water. It is also used in swimming pools as an algaecide. A dilute solution of copper sulfate is used to treat aquarium fish for parasitic infections, and is also used to remove snails from aquariums. Copper ions are highly toxic to fish, care must be taken with the dosage. Most species of algae can be controlled with very low concentrations of copper sulfate. Copper sulfate inhibits growth of bacteria such as E. coli.
Another use that's a lot more fun is adding color to your campfire or fireplace. Coating pine cones, corn cobs, sawdust, or any burnable material adds mesmerizing BLUE-GREEN flames. A short tutorial on coating pinecones with this product can be found here.
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