Advances the scientific understanding of when, how, and why phosphate-based corrosion inhibitors work in potable waters. Answers critical questions of inhibitor solution chemistry on lead and copper solubility using laboratory tests. Uses pipe rig experiments to compare the effects of dosing orthophosphate and polyphosphate on lead and copper by-product release. Also optimizes inhibitor doses in water when beneficial effects of phosphate inhibitors are observed. Published in 2001.