This standard covers sodium polyphosphate, glassy, for use in water supply service. This material is also known as sodium hexametaphosphate, sodium tetrapolyphosphate, and Graham's salt. The purpose of this standard is to provide the minimum requirements for sodium polyphosphate, glassy, including physical, chemical, sampling, packaging, shipping, and testing requirements. This standard 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.