GBL-Compact-S unit is a continuous loss-in-weight type feeder, applicable for dosing and mixing spherical, cylindrical, and flat raw material. It is suitable for production processes with continuous dosing, such as plastic extrusion and chemical fiber manufacturing. A precise single screw stem metering station is allocated on each product line by GBL-Compact-S system, and only colorants and additives are measured. The output of the main raw material is calculated, based on the screw rotation monitored speed or on the feedback signal of the melt dosing pump.