Additive Proportioning : Additive proportioning is the method (such as premix, metered, or balanced pressure) used for the introduction of an additive or additive mixture at the recommended percent ratio into the water system
NFPA 750 Standard on Water Mist Fire Protection Systems, 2003 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/75 0/750_FKT-AAA_SDAgenda_01-13.pdf, (Std: Wtr Mist Fr Prac Sys - Amer) {346 NFC}