5-Pack Replacement Holmes HM3500 Humidifier Filter - matching Holmes HWF75, HWF72 Air Filter

Essential for Allergy Sufferers.. Replacement Holmes HM3500 Humidifier Filter - Quantity, 5 Replaces Holmes HWF75, HWF72 Air Filter Traps liquid Impurities & Dissolved Solids Before They Become Airborne For best results, change air filter at least once per season or more often depending on air high-grade and use