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Honeywell HC-835 Replacement Filter for Robitussin and Vicks Natural Cool Moisture Humidifiers removes minerals and pollutants from water. Protec™ Antimicrobial Treatment helps prevent the growth and migration of mold, fungus, algae and bacteria on the filter. The filter material is reinforced for maximum efficiency and longer filter life. Plus, the exclusive Dry Lift Handle™ helps to keep hands dry and clean while changing your filter. Fits Robitussin® Model: DH-835 and can be used as substitute for HAC-504AW.