Product Short Description: pH control and water softening ability. Potassium dichromate is added to antifreeze-antiboil as a corrosion inhibitor. The pH control is used to maintain an acid free solution. The water softening ability deters formation of mineral deposits Inhibitor systems are available in various forms such as Product Description: pH control and water softening ability. Potassium dichromate is added to antifreeze antiboil as a corrosion inhibitor. The pH control is used to maintain an acid free solution. The water softening ability deters formation of mineral deposits Inhibitor systems are available in various forms such as coolant filter elements, liquid and dry bulk inhibitor additives and as an integral part of permanent antifreeze.