A customer specialized in the manufacture of pumps for china clay was suffering from short life time of the shaft seals, down to a few weeks. End users were not happy with the situation suffering from both down time and costs.  After an analysis of the application, the processed media and the equipment an especially designed cartridge seal was presented having a focus to manage current erosion as well as clogging problems. The design was well received bringing up the mechanical seal life time to end-user expectation.