Hi Brian. As mentioned by ...

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Hi Brian.

As mentioned by Dwight Petri disk of 3M is a low cost option (2 to3 US$ per test). It does test 1 ml so is not an official test (which should be 100 ml) but it indicates the number of bacteria and the type. SMART Centres  often use it to create awareness. For instance wells, boreholes with clear water can be contaminated and you can show that with a simple test.  Regards  Henk Holtslag  SMART Centre Group.