The evolution of the synthetic wastewater flux over time at two different TMP was evaluated for each membrane (Fig. 3).All filtration tests were performed until flux reached a pseudo-steady state. A sharp flux decline was observed at the initial stage, which continued decreasing over time. Subsequently, afinal stage was observed where the flux reached a pseudo steady state at approximately 60 min and at 100 min for GR60PP and OT050, respectively. The initial stage of the filtration tests was different for both membranes. A greater flux decline was reported for OT050 membrane due to its greater MWCO, porosity and hydraulic permeability.