Like many reviewers, the HEPA filter fell **completely** in layers (when I first washed the filter). See photo from another buyer. It was held together in various places with a few tiny drops of glue that melted through the use of a vacuum. After the filter was dry I managed to put all the layers together (2 ill-fitting outer plastic meshes, 1 main inner filter, a plain blue outer frame with a red button and a black rubber pad), but the plastic meshes were small too. for the outer blue frame (hence the manufacturer's glue) and the black rubber pad didn't stay in place (so the manufacturer glued it to the blue outer frame with 3 bullets that had been vacuum melted. On the original Dyson HEPA filter the black gasket was fully and permanently attached to the blue frame; impossible to separate the two. However, I had to vacuum, so I put the crappy filter back in the bowl. Within minutes of vacuuming, the filter was giving off a fishy glue smell ( there's no other way to describe it.) I threw it away (the post-HEPA filter, not the vacuum, of course; also kept the pre-filter) and ordered a new HEPA filter from Dyson.com. Expensive, yes. Coming 7-10 Days blowing But my DC25 Anumal is like new and sucks noticeably/measurably better with the original Dyson filter.