Through revolutionary modifications to membrane surface properties and chemical composition—paired with optimized formulations for both the support layer and thin-film composite (TFC) layer—XLE membranes achieve a significantly increased specific surface area and enhanced hydrophilicity. These advancements enable exceptional permeate flux rates at substantially reduced operating pressures. The XLE membranes are particularly well-suited for municipal wastewater treatment applications, standing as one of today’s highest-flux, lowest-energy-consumption membrane elements.