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Bacterial retention

The number of microorganisms that a membrane filter will retain upstream with no passage through the membrane. Usually expressed as a log reduction in the number of organisms (CFU - colony forming units), from a defined starting concentration.

FAQ
The number of microorganisms that a membrane filter will retain upstream with no passage through the membrane. Usually expressed as a log reduction in the number of organisms (CFU - colony forming units), from a defined starting concentration.
Bacterial retention tests are conducted in processing conditions in the worst-case client scenario. They are used to see the retainability of a sterilizing-grade filter for a minimum of 10’7 cells of Brevundimonas diminuta (B. diminuta) per cm2 of effective filtration area.