The PureFlo® pharmaceutical grade cartridges are designed to produce product sterility. The all-polypropylene construction provides excellent chemical compatibility and superior flow per unit area as compared to other membrane cartridges. PureFlo® pharmaceutical grades cartridges have been designed for final filtration in biopharmaceutical applications. The hydrophilic PES membrane does not require pre-wetting agents, thereby eliminating a potential source of contamination. The PES membrane has low protein-binding characteris-tics to maximize yields