This standard describes phosphoric acid corrosion inhibitor in liquid form used in the treatment of potable water, wastewater, and reclaimed water. It can be referenced in documents for purchasing and receiving phosphoric acid and can be used as a guide for testing the physical and chemical properties of phosphoric acid samples. The stipulations of this standard apply when this document has been referenced and then only to phosphoric acid used in the treatment of potable water, wastewater, and reclaimed water.