Genuine Hoover Bags & Filters It is recommended that all three filters be replaced after every 5 vacuum bags. These filters, 1 Secondary and 1 Final filter set (2 pieces), combine with the filter bag to create a 7 layer filtration system for your canister vacuum. As you vacuum, the filter bag collects debris as it filters the air. The additional layers of filtration combine to help filter any particles that might pass through the filter bag. This Filtration Replacement System is the easiest way to remember to change the filters and the filter bag. Following this simple system will help maintain peak performance of your vacuum and its filtration system.
