MIELE ACTIVE AIR CLEAN FILTER This filter combines the Super Air Clean filter with an active charcoal cassette which absorbs odors from the dust bag --especially useful if you have pets. This filter retains 99.95% of particles down to 0.5 of a micron (only 1 and 1/200th the width of a strand of human hair) and has a life of 50 hours, or 12 months, of use.