TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The manufacturing process is peeling, washing, pre-cooking, cooling, cooking (all preferred), ricing, and drying. The process water having solids is produced by the manufacturing process. The method further comprises: the step of passing the u/f permeate stream through at least one reverse osmosis (r/o) filter or series of reverse osmosis filters, each reverse osmosis filter produces a r/o permeate stream and a r/o concentrate stream and, where the r/o concentrate stream is introduced into vessel used for either ricing or drying or each r/o concentrate stream is fed to a successive reverse osmosis filter in the series to form a final r/o concentrate stream; and the step of introducing a processing additive into the potato process water before the potato process water is passed through u/f. The r/o concentrate stream is combined with the u/f concentrate stream and introduced into vessel used for either ricing or drying. The potato process water is passed through a series of ultrafilters, each u/f producing a u/f concentrate stream and a u/f permeate stream, where each u/f permeate stream is collected and each u/f concentrate stream is fed to a successive ultrafilter in the series to form a final u/f concentrate stream, where the final u/f concentrate stream is introduced into the vessel used for either ricing or drying. The final r/o concentrate stream is combined with the u/f concentrate stream. The final u/f concentrate stream and the final r/o concentrate stream are combined before introducing into the vessel used for either ricing or drying. The method comprises introducing an enzyme into the potato process water and passing the potato process water through u/f, where the enzyme is protease enzyme and an amylase enzyme, preferably alpha-amylase enzyme. The enzyme is added at 0.08-0.4 ml enzyme/pound of starch, preferably 0.2 ml and where the enzyme activity is at least 150 KNU-s/g. The enzyme is added continuously. EXAMPLE - No suitable example given.