Description. Solvent Filtration Disposable Vacuum Bottle Top Filter, 0.45um PTFE Membrane for Clarification and Prefiltration, 1000mL, GL45 Thread, Polypropylene Housing, Non-Sterile. The labForce Solvent Filtration Bottle Top Vacuum Filters offer a revolutionary approach to bulk solvent filtration. Safer, faster, and easier to use than