The whey was ultrafiltered until a voncentration factor of about 3x was achieved.DI water was then added as 40% of the original weight of whey. The whey was then ultrafiltered until a concentration was confirmed with a Sprint Rapid Protein Analyzer. Percent solids were analyzed using the Smart System 5 moisture/solids analyzer. The percent solid in the liquid retentate was 24.28% +- 0.60%. The liquid retentate was held overnight at 4°C.