Figure 6 Membrane sweep in HPTFF operation upon crossflow stop. Inlet pressure of the retentate (\(\text{PT}_{R1}\)) and inlet pressure on filtrate side (\(\text{PT}_{F1}\)) were recorded upon a 3 sec stop of the levitated centrifugal pump (\(\text{CD}_{R1}\)) to release air bubbles (A). The delta pressure (\(\text{PT}_{R1}-\text{PT}_{F1}\)) was calculated and the blue area represents a negative delta pressure during which a backflush is happening in the first half of the filter, whereas the red area represents a positive delta pressure resulting in a backflush at the second half of the filter (B).