To test the UV I collected some water down stream of a chemical plant, this water had a high concentration of e.coli and other bacteria. I used the UV light to sterilise the water.
A process called Membrane filtration is used to test for e.coli bacteria, by filtering the water though a membrane of 0.45 micron the e.coli bacteria will stay on the surface. Put the infected membrane into a growth mixture and incubate for 24 hours. You can then see if there are any e.coli colonies formed. A number of control samples had to be carried out at the same time to verify the results.
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