... is low phosphorus, green, eco-friendly water treatment chemicals 2-Phosphonobutane -1,2,4-Tricarboxylic Acid(PBTCA)CAS No. 37971-36-1Molecular Formula ... system as scale and corrosion inhibitor, suitable to composite with zinc salt and copolymer. It can be used in ... chelating agent and metal detergent.PBTCA is usually used together with zinc salt, copolymer, organophosphine, imidazole and other Water ...