HQRP Humidifier Wick Filter traps impurities in the water and promote a healthier environment. The package contains 2 wick filters. Compatible with IDYLIS 828413B002 149101 Replacement fits IHUM-10-140 / I HUM 10 140 4-Gallon Humidifier. Replace your Humidifier Filter about every 2-3 months (under normal use) for optimum performance and maximum humidity output.