3 Micron Filter found in: 5 Micron Filter, 0.45 Micron Filter, CN Filter Units, Cycloheximide solution, 100mg/mL in DMSO, 0.2 micron filtered, PVDF 0.45.. syringe filter. Other than the 3 mm size filters, these filters provide bi-directional support of the membrane, allowing sample injection or aspiration.