The services provided by CALAGUA group also include the microbiological analysis of biological treatment systems, applying the FISH technique with image analysis and qPCR analysis to quantify specific bacterial groups.

Bacterial groups of interest can be detected and quantified in this way, including those of: ammonium-oxidation, nitrite-oxidation, denitrifiers, poly-phosphate accumulating and glycogen accumulating organisms, sulphate reducers, methanogenic archaea, etc. Cellular viability can also be determined by fluorochrome combination to analyse the integrity of the membrane and flow cytometry.