Guided filters help to reduce the re-release of dust, pollen and other allergens into the air after vacuuming; The filter should be knocked out over the bin after each use to get the full performance of your MultiReach ION XL; If necessary, rinse it under cold water and allow the filter to dry for 24 hours before reinserting it; Replace your filter approximately every 6 months depending on how you use it; The filter is easy to remove, wash and replace without tools