A device for producing a skim milk starting material milk is disclosed. The device includes a first centrifugal separator that separates milk into a cream fraction and a skim milk fraction, a microfilter that separates the skim milk fraction into a permeate and a retentate, a second centrifugal separator that separates the retentate into a clean fraction and a high bacteria content sludge, and a means for returning the clean fraction to the microfilter. The permeate is provided as the skim milk starting material milk.
