Humidifier filter features Protec technology to inhibit up to 99.99 percent of mold, algae and bacteria growth on the filter. Air washing pre-filter helps capture large particles such as pollen from the air that passes through the filter. Dry-lift handle helps keep your hands dry and clean while replacing your used filter. Plus, its versatile design helps remove minerals and pollutants from the water in your humidifier. Replacement filter is designed for use with compatible Honeywell humidifiers (sold separately).