togameoy Demineralization Cartridge & Clean Mist Cartridge 2-in-1 Compatible with Dreo Humidifier HM311 HM311S HM524 HM524S HM306, Reduce Mineral and Contaminants, Filter Hard Water, 4pcs (DR-HPA020) 4pcs HM311/311S/524/524S/306/409S Filter is up for auction in Appliances. This item is in Good Condition. This auction has ended — similar items appear in live auctions regularly.