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The Holmes HWF23 Humidifier Filter features Microban technology and Arm and Hammer baking soda for built-in protection that inhibits the growth of bacteria, mold and mildew that cause bad odors and stains.
The HWF23 filter fits Holmes humidifiers HM1200, HM1250 and HLS1200. This genuine OEM Holmes filter replaces Bionaire filters BWF23 and BWF23CS. It is also known as HWF-23, HWF23CS and HWF23-CS.