Ultrafiltration is highly effective method for removal of bacteria and viruses and does not produce organohalides associated with water treatment by chlorine gas. The aim was to assess the hygiene suitability of the unit for possible use in bottled water production. The ultrafiltration unit was in operation for 220 hours with simulated of varying duration. The running time (220 hours) and shut-down duration (to 5 hours) did not in any way influence the effectiveness of the module (100 % filtration of aerobic colony count at 37 °C and 22 °C).

        Key words: bacteria, ultrafiltration, bottled water, quality