Video 7 from paper "BUOYANCY EFFECT ON THE ULTRAFILTRATION OF PEG10000. VISUALIZATION BY DIGITAL HOLOGRAPHIC INTERFEROMETRY", submitted to AIChe Journal, 2011. Video shows the first 3 min at the beginning of experiment and the first 6 min after the pressure ceased. The speed is increased three times during the UF process, whereas after the pressure ceases the speed is increased 6 times