Protec antimicrobial treatment helps prevent the growth and migration of mold, fungus, algae, and bacteria. Removes minerals and pollutants from water. Reinforced for maximum efficiency and longer filter life. Air washing layer helps capture dirt, dust, and pollen. Fits Honeywell model No. HCM-890B and Duracraft model No. DCM-200, DH890, and DH-888.