Millex® filter units 33 mm, sterile, pore size 0.22 µm, PES membrane, 50 unit(s)Millex filter units 33 mm, sterile, pore size 0. 22 m, PES membrane Sterile Individually packed. Housing made of modified acrylic. Hydrophilic Millipore Express membrane. Intended use: outside the U. S. and Japan, Millex GP HP filter units are intended for use as a syringe filter to sterilize and or clarify low volume solutions in direct patient care and pharmacy admixture applications. Application: sterilisation of tissue culture media and additives,