Genuine Numatic 906422 MicroTex Filter (160 Drum)Genuine Numatic 906422 MicroTex Filter (160 Drum) This filter is a genuine Numatic henry hoover filter product and is the ideal replacement for an old or clogged up filter in your vacuum. I This filter is not washable but should last a long time if you use your vacuum cleaner with genuine Numatic dust bags. The filter should be brushed off during each bag change to get the maximum lifespan from it. This filter is not washable. Please see below for the