HQRP Filter 3-pack for Honeywell HC-888 HC-888N HCM-890 Humidifier + HQRP Coaster HQRP&reg; 3-pack Cool Mist Humidifier Filter Replacement plus HQRP&reg; Coaster; Filter Helps To Capture Mineral Deposits And Improve Efficiency Of The Humidifier; For Maximum Performance Change Filter Every 30 Days; Compatible with Original filter. 2 weeks DOA replacement warranty!