UpStart Battery 3-Pack Replacement Sunbeam SCM3755C Humidifier Filter - Compatible Sunbeam SF221, SWF-75 Air Filter Replacement Sunbeam SCM3755C Humidifier Filter - Quantity, 3 Replaces Sunbeam SF221, SWF-75 Air Filter Traps Water Impurities & Dissolved Solids Before They Become Airborne For best results, change air filter at least once per season or more often depending on air quality and use. Essential for Allergy Sufferers. On Sale for a Limited Time!