After my vacuum got clogged and then stopped using the dust box and instead threw dirt and dust into the secondary filter on top and the HEPA filter it really made a difference mess . I was about to clean the secondary filter and replace the HEPA filter but found this kit and thought it was time to replace both. *Turned the thing on." I found myself putting the filter back in place and then snapping it into place with a quick but not too hard tap on the top.