When Inexa planned to increase charge weights, it was important to increase productivity of the caster in order to meet the requirements from the primary furnaces. With the existing caster and for certain grades difficulties arise to meet quality standards at increased casting speed. To counteract this problem soft reduction technique was planned to be developed. A solidification model of the Inexa bloom caster was developed using the software package TEMPSIMU to aid in the design of a soft reduction unit. Additionally, a 3-dimensional solidification model of the crater end position and shape during transient casting conditions was developed using the software THERMAL TRACKING. Shell thickness measurements using the wedge method were conducted for calibration of these models. A soft reduction unit was built and installed in one strand of the Inexa bloom caster. Soft reduction trials were carried out on the caster. The result from the trials indicated that it is possible to improve or maintain the centre quality of the blooms at increased casting speed with the installed soft reduction unit.