Bacteria Population (CFU) G. stearothermophilus Initial 25 25 25   Autoclave sterilization 28 21 27   Ozone gas sterilization 11 11 17 M. luteus Initial 34 34 34   Autoclave sterilization 31 27 27   Ozone gas sterilization 0 0 0 Autoclaving was conducted at 121.1°C for 15 min. The concentration of ozone gas was 3000 ppm for 15 min. RH 80 %. PS is polysulfone.

Table 2: Results from cultivation of inoculated G. stearothermophilus ATCC 7953 or M. luteus onto PS from Millipore sterilized by autoclaving or by use of ozone gas