ATMP: Amino Trimethylene Phosphonic Acid HEDP: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid PBTCA: 2 - Phosphonobutane - 1,2,4 -tricarboxylic acid ATMP.Na3: Trisodium Salt of Amino Trimethylene Phosphonic Acid HEDPâ?¢Na4: Tetra sodium salt of 1Hydroxy ethylidene-1,1-diphosphonic acid SHMP: Sodium Hexametaphosphate PBTC: 50% active aqueous solution of 2-phosphonobutane-1, 2, 4-tricarboxylic acid Phosphoric Acid STPH: Sodium Tripolyphosphate Trisodium Phosphate Disodium Phosphate Monosodium Phosphate STPP: Sodium Triphosphate DAP