Conduct vacuum filtration and single-use biological work requiring sterile filtration, prefiltration or clarification of aqueous solutions in the lab or field with Thermo Scientific™ Nalgene™ Rapid-Flow™ Sterile Disposable Filter Units with SFCA Membrane. Surfactant-Free Cellulose Acetate (SFCA) membranes have lower extractables than standard (CA) membranes.