Behind the settling columns lighting was installed to accentuate the water/mud interface. The water/mud interface was monitored by taking pictures at variable time intervals. Based on the contrast between the water layer and the mud, the interface level was automatically determined using the standard "straight edge detection" algorithm available in LabView. The output of this, are the CSV files containing the evolution of the interface level over time, expressed in pixels. These values are converted to mm and further processed to generate the settling curves.