HQRP Humidifier Wick Filter traps impurities in the water and promote a healthier environment. The package contains 6 wick filters. Compatible with Emerson MoistAIR 1205, 1211, 2412, HD500, HD6200, HD7002, HD7005, HD70020, HD70021, HD70050 Humidifiers; part HDC-2R & HDC-411 Replacement. Replace your Humidifier Filter about every 2-3 months (under normal use) for optimum performance and maximum humidity output.