While the use of Dipslides is not advocated by HTM01-05 Paragraph 19.68 as they are not sensative enough for use as a test for drinking water quality nor do they detect legionella, they are quite capable of detecting the higher levels of bacteria associated with the presence of biofilms, so they could be used frequently as an inexpensive method of checking that gross bacterial invasion is not occurring.

Where Dipslides are taken they should be used according to the manufacturers instructions.