We recommend the Demineralization Cartridges as great replacement while these are out of stock.

Click Here: Boneco Air O Swiss Compatible Ultrasonic & Steam Humidifier Demineralization Cartridge. 

This high-quality filter is not an original OEM part but is designed to replace discontinued filters, or filters that are out of stock.

Boneco A250 Aqua Pro 1 Pack

• Significant reduction of water hardness
• Included Active Carbon absorbs impurities and removes odor from the water
• Extremely economic – lasts up to 6 months
• Includes a free water test strip to measure the lifetime of your A250 AQUA PRO
• for all Ultrasonics except U7131, U7136, U7137 and U7138