ANSI/AWWA B502-11
This standard covers sodium polyphosphate, glassy, for use in water supply service. This material is also known as sodium hexametaphosphate, sodium tetrapolyphosphate, and Grahams salt. The main purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for sodium polyphosphate, glassy, including physical, chemical, packaging, shipping, and testing requirements.