FAQ Search Select a Category BarkBath 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? Where can I get a replacement brush and brush belt for my BISSELL Go Vac? Why doesn't the power cord rewind fully on my Pet Hair Eraser® or Opticlean® Cyclonic Vacuum? My Powergroom® Pet Canister Vacuum power cord does not rewind fully. What should I do?