In the figure below an example of the standard plotter function in the AFSM. After a certain amount of time the flow of the supply pump of the fishtank is descreasing to a level where it has to be cleaned or exchanged. On the left side of the plotter form (orange pen) the old value of the flow; 477 l/hr and at the right side after installing a clean pump; 570 l/hr. Between the PV’s, while exchanging the supply pump. The difference between the dirty and clean pump is about 100 l/hr.