Sunbeam SF221 Humidifier filter with Color Check, 2PK Breathe in fresh relief from dry air Prevent dust, dirt and impurities from building up on the filter of your humidifier and spreading into the air. Replace your humidifier with the Sunbeam Cool Mist Universal Filter for fresher, cleaner moisture featuring an exclusive Arm & Hammer baking soda to help remove household odors. For use with Sunbeam Humidifier models SCM3755C, SCM3501, SCM3502 and SCM3657. Includes Color Check, a purple color strip that turns red when it's time to change the filter.