This standard describes sodium polyphosphate, glassy, for use in the treatment of potable water, wastewater, and reclaimed water. This material is also known as sodium hexametaphosphate, sodium tetrapolyphosphate, and Graham's salt. It can be referenced in documents for purchasing and receiving sodium polyphosphate, glassy, and can be used as a guide for testing the physical and chemical properties of sodium polyphosphate, glassy, samples. The stipulations of this standard apply when this document has been referenced and only to sodium polyphosphate, glassy, used in the treatment of potable water, wastewater, and reclaimed water.