Synonyms: Phosphonic acid, P,P',P'',P'''-(1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, potassium salt (1:4);Ethylene bis(nitrilodimethylene)tetraphosphonic acid, tetrapotassium salt;Ethylenediamine tetrakis(methylene phosphonic acid) tetrapotassium salt;Phosphonic acid, (1,2-ethanediylbis(nitrilobis(methylene)))tetrakis-, tetrapotassium salt;Tetrapotassium tetrahydrogen (ethane-1,2-diylbis(nitrilobis(methylene)))tetrakisphosphonate;phosphonic acid, [1,2-ethanediylbis[nitrilobis(methylene)]]tetrakis-, potassium salt (1:4)