Pore size or nominal rating: 0.2-0.45 um, 0.05-1.0 um, 0.20 um, 0.8-30 um, 0.45-1.0 um; Cannot be used for air filtration ; Typical Applications. Filter tissue culture media, fermentation broth, and ground water; Can be set in serial mode to maximize throughput volumes; Point-of-use sterile filtration