The test vial detects the presence of microorganisms (bacteria, fungi and biofilm) based on the limit of 500 cfu/mL. Microorganisms include water-borne bacteria, such as Pseudomonas species, Escherichia coli, Staphylococcus aureus, Bacillus megaterium, Pseudomonas putida, Salmonella cholerasuis, and various yeast and mold.