Features:

• Fits all Air-o-Swiss Ultrasonic appliances.

Editor Reviews:

Product Description:
Replacement 7531 De-Mineralization Cartridge 7531, For Air-O-Swiss Ultrasonic Humidifiers, Easy To Replace, Prevents Development Of White Dust, MAP PrP Price $12.50.

Rating : - works well
pricey, but if you own the humidifier you have to get the replacement cartidge without it the mist does not feel the same.