Honeywell Humidifier Wick Filter, Single, HAC-504V1 (6) The HAC-504V1 is an updated model of the HAC-504AW Removes minerals and pollutants from water Reinforced for maximum efficiency and longer filter life Protec antimicrobial treatment helps prevent the growth and migration of mold, fungus, algae and other bacteria Dry Lift Handle helps to keep hands dry and clean while changing your filter