Our Dyson started blowing the post motor filter off its mount after about 5 minutes of use. When I googled the question, it turned out that the filter could be clogged. I decided to replace the native filter (it has been washed several times and is also about 5 years old). The vacuum cleaner is quieter and works almost like new. I will say that the filters appear to be made of a lighter material than the original and only time will tell if they hold up. Will be updated if my impression changes.