Product review (2 stars): This cartridge is made by the Boneco company that took ...
This cartridge is made by the Boneco company that took over Air-O-Swiss.  The original Air-O-Swiss manufactured cartridge was made with some silver to prevent algae/mold/mildew in the water reservior.  It was marked with "Ag" which is the chemical designation for silver.  This Boneco cartridge was marked with "Na" which is the chemical designation for sodium.  When I asked Boneco about it - they claimed that the "Na" stood for "not applicable" - yeah...right...  It's printed in the same position on the outside of the cartridge as the "Ag" was printed on the Air-O-Swiss made cartridge.  I wrote them stating that I did not appreciate paying for silver and getting no silver since the price of the old and new cartridge are the same.  Also carrying over from the old cartridge is the exact same name and part number as the old silver containing cartridge.  "Air-O-Swiss AOS 7531"  So I tried the new Boneco cartridge and now the water and it's reservoir smell very musty.  Boneco claimed the beads inside the cartridge are exactly the same...