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Two identical hollow fibre membranes used for ultrafiltration as prefiltration stage of water drinking treatment were tested for assessing the efficiency of cleaning, by using hydrodynamic cavitation. Each membrane with outside-in permeate flow direction, and the same molecular weight cut-off (0.097 m) was placed vertically inside glass cylinders. One hollow fiber membrane was subjected tohydrodynamic cavitation and cavitation during backlfushing. For the other membrane no treatment was provided for comparison rea...