I should also add, using ATP monitoring such as the Bioscan can provide results after 1 minute.  Testing the ATP before and after dosing bio-dispersant will detect the release of slime because the ATP readings increase.  This is a good technology to use.  Although it does not differentiate between Legionella and other bacteria it does provide a good indication of bacterial levels and any changes.  These can be confirmed by conventional plate counts and Legionella tests.

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I should also add, using ATP monitoring such as the Bioscan can provide results after 1 minute.  Testing the ATP before and after dosing bio-dispersant will detect the release of slime because the ATP readings increase.  This is a good technology to use.  Although it does not differentiate between Legionella and other bacteria it does provide a good indication of bacterial levels and any changes.  These can be confirmed by conventional plate counts and Legionella tests.