Copper Diammonium EDTA EDTA is extensively used initialism for the chemical compounds ethylenediaminetetraacetic acid. These colourless, water-soluble solid is widely used to dissolve scale. The usefulness of compound arises because of its role as a chelating agent, i.e. its ability to "sequester" metal ions such as Ca2+ and Fe3+. We can offer EDTA in variety of grades and compositions based upon the requirement of the clients.