A heavy metal precipitant used to remove metals from wastewater streams. METALTREAT 513 is particularly useful in the treatment of wastewater from plating operations. It is effective over a wide pH range and, when used as recommended, provides nearly complete precipitation of metals, even in the presence of other chelating or sequestering agents. The sludge cake produced from its use is compact, highly insoluble, and easily dewatered. Its low solubility means that it is less susceptible to leaching and is more likely to pass leaching tests such as those required by the U.S. EPA.