13mm Blue PP Syringe Filter
Another way to determine the micron size of columns, 0.45 um for >3 um, and 0.22 um for <3um. 0.45 um membranes are typically used for general filtration and particle removal while 0.2/0.22um membranes, or sterilizing-grade membranes, are most commonly used for solution sterilization (bacteria removal).
The most commonly used syringe filter pore sizes are 0.2/0.22 um and 0.45 um syringe filters, for research and medical applications. The pore size to be used is usually determined by the particle size to be eliminated. For example, for the purpose of filtering out particulate >0.2 microns in diameter, then choose a syringe filter with a 0.2 micron pore size.