Publication Details (including relevant citation information): Method for supplying corrosion inhibiting zinc soln. for the interior surface of metal water pipes. Deblois, Richard E.; Pisarczyk, Kenneth S.. (Carus Corporation, USA). U.S. (2002), US 6391384 Abstract The method comprises the steps of (I) mixing zinc ion source and aqueous phosphoric acid to provide an aqueous phosphate mixture, and (II) adding water into the mixture at such concentration that the transportation rate is effective for depositing onto the interior surface of the metal pipes. The zinc ion source selected from the group consisting of zinc metal, zinc metal oxide and mixtures in an amount effective for providing a zinc ion concentration of 0.05 wt% in the soln. The phosphoric acid is in an amount effective for providing phosphate concentration < 10 wt% in the solution, the solution having <1 wt% sulfate ions, and <1 wt% chloride ions. The aq. mixture contains <3 wt% impurities and the aqueous phosphoric acid in an amount which is effective for providing a solution having a pH <2 to provide a corrosion inhibiting concentrated solution.