SimPure 100 Pack Sterile Syringe Filter PES, 0.22um Pore Size . FILTER DIMENSION: It is 33mm membrane diameter and pore size:0.22um, pack of 100. Suitable pore size structure for lab sterilization of small volume samples. Finding Pure Water for Record Cleaning – very long. In all cases, micro-filtration with 0.22-micron filter must be used.