We need to reduce the portions of such impurities to reduce possibilities of corrosion.For locating the ppm values we need a special calculator like the sections for each million calculator. If percentages, for every mille, and components for each million continue to confuse you, give this PPM calculator a shot. https://ppmcalculator14689.blog2news.com/37351489/5-simple-statements-about-ppm-calculator-explained