FAQ Search Select a Category Cleaning Formulas Cleaning Tips Commercial Products Corporate Deep Cleaners Hard Floor Cleaners Mops, Brooms and Brushes Parts and Accessories Steam Sweepers Vacuums Warranty Web Site and/or go What is the purpose of the Clean Filter Indicator? Answer: The Clean Filter Indicator, located on the upper-tank of your vacuum, lets you know when airflow in the vacuum is reduced due to dirty filters or a clog. If airflow is reduced, the light will change from green to red. Related Questions Why is my vacuum sounding loud? What should I check? Why is the brush roll on my Lift-Off® Floors & More not turning? The brush on my Powerlifter® (1307 & 1309 models) is not spinning. What do I check? My AeroSwift® Vacuum has no power. What should I do?