FAQ Search Select a Category Cleaning Formulas Cleaning Tips Corporate Deep Cleaners FAQ Hard Floor Cleaners Parts and Accessories Steam Sweepers Vacuums Warranty Web Site and/or go What is the purpose of the Lift-Off Bagless clean filter indicator? Answer: The Clean Filter Indicator is located on the upper-tank above the BISSELL logo. This indicator tells you when airflow in the vacuum is reduced due to dirty filters or a clog, by turning from green to red. Related Questions Why isn't there any suction with my Pet Grooming Tool? My Garage Pro® blower mode is not functioning. What should I do? The handle on my Momentum or PowerTrak Cyclonic Vacuum is difficult to install. What can I do? My Momentum® or PowerTrak® Cyclonic Vacuum is hard to push. Any suggestions?