CitriSurf 2210 is specifically designed to provide low cost and efficient removal of all free iron from the surface of stainless steel and other metals, providing the highest chrome oxide levels possible. CitriSurf 2210 is intended for use without dilution, but if it is advantageous or necessary to slow down the reaction rate or lower the viscosity, it may be diluted with water at a maximum 1 to 1 ratio by volume.