In the confirmed test, formed colonies on the endo agar and EMB plate indicate Gram-negative bacteria. The red colonies and surrounding medium on the endo agar plate and the nucleated colonies formed on the EMB plate indicate lactose fermenting (coli-form) bacteria. The number of colonies were not counted on any of the two plates.

Membrane filtration method and Gram-staining

The results from the membrane filtration and Gram-staining can be seen in Table \ref{membraneresults}. All colonies on both the 10 ml and 1 ml were evenly distributed across the filter. Area approx. 9.62 cm2.