Maax® BF is Maag’s well-proven control system for the fully automatic backflush Screen changers. It allows the processor of highly contaminated polymer melts a simple handling of the backflush screen changer and a fully automatic screen cleaning and manifold use of the screens. The automation system is particularly well suited for retrofitting extrusion lines with screen changers with backflush function. Operation, control, and Regulation as well as monitoring of operating parameters are simplified. Process and operation reliability of the entire system are increased.