Coliform Testing
A Method of Testing for the Detection, Enumeration, and Identification of E. coli and Coliform Bacteria for The Non-Specialist Which Requires No Prior Formal Training
The use of 2 different media allows for an evaluation process called Drop Out Plating. The Coliscan media drops out many general bacteria with the target of the recovery being total Coliform Bacteria: color coded growth of E.coli being blue, other Coliform Bacteria pink. The Total Number (TN) of Coliform, including E.coli, should be counted as 1 organism: one Coliform bacteria for enumeration purposes. The count of the General Bacteria culture will be the higher count culture. Subtract the Coliform count from the General bacteria count and you can approximate the count of non-Coliform bacteria in your sample.
This is the Coliform Test as made by Micrology Laboratories manufactures Easygel( TM) Get the details here.
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Laboratory In A Box

