Burnt limestone is stored in silos before being processed. It generates dust during the filling process and tends to stick to the silo walls, creating rat holes and build-up. As it is a critical material for the process, users need to control and monitor the actual level in the silo to prevent process stoppage. Knowing how the burnt limestone is distributed inside the silo allows detection of build-up. This facilitates scheduling of timely maintenance and cleaning to avoid unexpected interruptions of the process and associated losses in time and money.