Air O Swiss Demineralization Cartridge 7531

Air O Swiss Ultrasonic Humidifiers require a changing out of the demineralization cartridge to insure the humidifier is extracting all the minerals out of the water as it humidifies the air.  Air O Swiss recommends that you replace the cartridge every 2-3 months, however if your water is "hard" you will need to change it more frequently. 

Air O Swiss Model 7531 includes a demineralization cartridge and granules.  If your cartridge is still in good condition you can elect to purchase just the granules by themselves, Air O Swiss Demineralization Granules 7533.

Fits Air O Swiss Models: AOS U600, AOS U650, AOS 7131, AOS 7133, AOS 7135, AOS 7142, AOS 7144, AOS 7145, AOS 7147.