References in periodicals archive ? Gross profit for potassium chloride and potassium sulfate accounted for approximately 26% of SQM's consolidated gross margin for the nine months ended September 30, 2015. Highly pure food-grade potassium chloride (KCl) is used in food and drinks, i. A protocol on Guidelines for Potassium Chloride Supplementation is maintained by the hospital. The same concentration of potassium chloride added directly to the water, along with inert spheres, caused few if any deaths.