In each case, intrinsic membrane permeability was determined by filtration of UP water through the module at different transmembrane pressures in dead-end mode (0.2, 0.4, 0.6, 0.8, 1.0 and 1.2 bar). Pristine HFs pure water permeability (Lp) was on average 283 L/h/m²/bar and decreased ...