A250 Aqua Pro Humidifier Water Filter for Boneco & Air-O-Swiss Ultrasonic Humidifiers
2-in-1 Water Filter for ultrasonic humidifiers significantly reduces water hardness. Plus, activated carbon in filter absorbs impurities and removes odor from the water. The Aqua Pro is extremely economical and lasts up to 6 months.
Includes a free water test strip to measure the lifetime of your filter. The Aqua Pro is a direct replacement for the A7531 Demineralization Cartridge.