Product review (5 stars): Air-O-Swiss cartridge
We bought our humidifier several years ago, and have been unable to find these replacement cartridges.  We both suffer from allergies and dry out so badly during the winter.  We like this product because it doesn't cause all the white dust in our room.  This was by far the best value we found and were both so excited to find these cartridges because our machine is several years old.  We now rest better and rest a lo better in the winter.  Would highly recommend!!