Whatman VACU-GUARD Disposable Filters Whatman. Combining top-notch and uncompromising quality with an affordable price the Whatman VACU-GUARD Disposable Filters Whatman 6722-5000/ 28137-858 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: Vacuum protection filter device designed to prevent fluid and aerosol contamination of vacuum pumps or aspiration suction systems and eliminate hazardous exhaust. Install in the tubing line immediately prior to vacuum pump to eliminate pump and vacuum system damage; install on the exhaust side of pump to protect personnel from exposure to airborne pathogens and other aerosol environmental hazards. PTFE membrane in polypropylene housing with stepped hose barb connections. Particle retention in air: