A 5 g/l suspension of yeast in water was microfiltered in a Millipore 0.2 mu m unbaffled tubular ceramic membrane. The crossflow was interrupted periodically (6.3-6.8 Hz) by means of the crossflow-induced oscillation of an externally pressurised flexible tube upstream of the membrane module. The time-averaged Reynolds number at the membrane inlet was 3940, corresponding to a crossflow velocity of 1.34 m/s. The time-averaged transmembrane pressure, (P) over bar(tm), was varied from 50 to 300 kPa. Flux enhancement (pulsating-flow flux/steady-flow flux) increased with (P) over bar(tm), to a maximum of 102%.