Video

Membrane Filtration Demo

Membrane filtration (MF) is the most accurate method to determine the number of indicator bacteria in a water sample and is internationally recognized as a standard method for water quality testing. Membrane filtration can be done in a laboratory or by using a portable test kit as demonstrated in this video.

In general, a 100 mL water sample is filtered through filter paper using a small hand pump. After filtration, the filter paper is placed in a Petri dish with a nutrient solution and incubated at a specific temperature and time. After incubation, the bacteria colonies are counted to determine the number of colony forming units (CFU) per 100 mL.

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CAWST is a Canadian charity and licensed engineering firm. We address the global need for safe drinking water and sanitation by building local knowledge and skills on household solutions people can implement themselves.