Orthophosphate is a commonly used corrosion inhibitor that is added to finished drinking water. It works by forming a protective coat inside pipes in the distribution systems and in customer homes to prevent lead from leaching into drinking water. The other name is phosphoric acid and it is used to control alkalinity/acidity in foods and beverages. It is a vital parameter for boiler cooling and process water treatment. This AE301 – PHOSPHATE TEST KIT is again based on colour comparison in simple and easy steps.