In WP4 the performance of the new fine screen technology and the impact on the wastewater treatment process will be assessed in order to create a clear reference for further market uptake of this technology. Daily operation by the operators of WWTP Aarle Rixtel will be supplemented with additional standard and specific monitoring. For this a detailed monitoring plan will be prepared and executed. Data collection, analysis and evaluation will accumulate in an overall performance assessment of the new process. The environmental and economic impact of the project will be reported.