Advantages of the nutrient pads using the filter method
Tests for coliform bacteria and Escherichia Coli (E.Coli) by the membrane filter technique (see ISO 9308-1) are the most important routine microbiological examinations carried out on drinking water. These tests are based on membrane filtration by vacuum, subsequent culturing on a differential agar medium and calculation of the number of target organisms in the sample.
Picture shows Coliform Agar**
Mixed culture with Escherichia coli (blue colonies), Enterobacter aerogenes (purple colonies)and Pseudomonas aeruginosa (beige colonies) after 20 hours at 37°
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