The BioMonitor^® from LAR Process Analysers AG is suitable for many different applications, e.g. for fast and reliable load ratio documentation of the influent and effluent of any plant with the aid of either the BOD concentration or the BOD load, for controlling the denitrification at the effluent of any plant by exact dosing of the waste water as carbon source, for adjustment of a constant sludge load by calculating the amount of return sludge with help of the known concentration of biological degradable substances, present at the influent, for water monitoring at water quality monitoring stations.