Tanco, a leather manufacturer, uses large quantities of common salt to preserve animal hides  New environmental regulations have significantly increased the cost of disposing of salt water that results from this use, and, in consequence, Tanco is considering a plan to use potassium chloride in place of common salt
Research has shown that Tanco could reprocess the by-product of potassium chloride use to yield a crop fertilizer, leaving a relatively small volume of waste for disposal
What environmental regulations, if any, constrain the disposal of the waste generated in reprocessing the by-product of potassium chloride.