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Membrane filters or membranes are microporous plastic films with specific pore size ratings. Also known as screen, sieve or microporous filters, membranes retain particles or microorganisms larger than their pore size primarily by surface capture. Some particles smaller than the stated pore size may be retained by other mechanisms. Available in different materials, diameters and poresizes, sterile or non-sterile. Membrane filters are most easily handled with a forceps for filters. If the membrane filters hold a sample for analysis, then the filter with the sample can be safely transported from test site to analysis facility in a transport cassette. Sterile definitions