Whey diafiltration was carried out with a UF25-PAN polyacrylnitrilic membrane with 25 kDa molecular weight cut-off at volume reduction factors (VRF) VRF=2. VRF=4. VRF=6. VRF=8. https://www.roneverhart.com/SPL-2Control-Stereo-Monitor-Controller-p15743/