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Membrane Filtration

A laboratory analytical technique for the quantitative and qualitative analysis of bacterial or particulate matter in a water sample.

Upon filtering through a membrane of specified pore size (e.g., 0.45 micron), bacteria and particles of larger size are separated from the water sample and are retained on the filter. Then by incubation with a suitable nutrient and temperature, the captured bacteria will grow to visible colonies that can be counted; or by careful weighing, the amount of suspended particulate solids can be determined in the water sample.