Meva Monoscreen RSM has a motion which retains the prescribed bar slot width during the entire working cycling. Due to the progressive motion, only a small part of the screenings mat is transported up during each "step" cycle. This minimize the rush of water through the screen that can occur after a screening cycling in other step screens. Additionally, the Monoscreen can be operated with very short intermittent pulses and does not have to make a complete working cycle to the home position.