Bissell Style 8 Post-Motor Vacuum Filter is essential to optimize your vacuum's performance, ensuring it operates at peak efficiency. Regularly checking and replacing vacuum filters is crucial for maintaining optimal functionality, whether your vacuum is bagless or bagged. Bissell recommends replacing filters every 3 to 6 months or when you notice a decline in performance. For households with pets shedding hair or frequent foot traffic introducing dirt and debris, more frequent s may be necessary. This filter fits a wide range of Bissell vacuum models, including PowerGroom, Lift-Off Multi Cyclonic Pet, Pet Hair Eraser Upright, Momentum Upright, Powertrak Cyclonic, Velocity Upright Bagless, and more, helping keep your home clean and your vacuum running smoothly. Model Number: 8