DESC: Fits Miele Galaxy models S4000 series. 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 Designed for normal household use Made of electrostatically-charged multy-ply material Generally Activated Carbon layer removes all types of odors Removes up to 94% of particles as small as 0.3 microns Replacing the Active Air Clean Filter at least once a year is recommended.