HQRP Filter for Sunbeam Humidifier SCM3501, SCM3502, SCM3657, SCM3656, SCM3609, SCM3609P, SCM3755, SCM3755C Coaster HQRP&reg; Humidifier Wick Filter Replacement + HQRP&reg; Coaster; Improves efficiency of the humidifier, traps mineral deposits from the water; Extended filter life with help of reinforced layer; Replace filter every 4-6 weeks, depending on usage and hardness of water; 2 weeks DOA replacement warranty!