Method of manufacturing a low-Rinhoei

The present invention a process for the preparation of low Rinhoei, raw whey solution was desalted by nanofiltration law, to obtain a low chlorine whey liquid chlorine content is reduced to less than solids per 100g 30 mmol, and, said low chlorine whey solution was passed through an ion exchange resin, the method comprising phosphorus content obtained ion-exchange whey liquid which has been reduced, the ion exchange resin is made of an anion exchange resin, as the anion exchange resin It relates to the aforementioned method of using at least chlorine-type anion-exchange resin. The present invention can provide while suppressing the reduction of the content of calcium and magnesium contained in the whey, the method for producing a low Rinhoei capable of reducing the content of phosphorus.