Looking for a replacement filter, have one of these Holmes humidifier models: HM1888, HM1889, HM2059, HM3000, HM3800, HM3850, HM4000, HM1855, HM1865, HM1850, HM1851, HM1845, HM1840, HM1895, HM2060W, check out the HWF65PDQU filter. This can also be used as a Type C Filter for use with HM1865 and HM1895. A reinforced outer layer provides extra strength. Make sure to always check your filter to make sure it is in good working condition. In doing so, you'll ensure your machine is running properly and your air is just the way you want it.

　　- Improves efficiency of the humidifier

　　- Extended filter life with help of the reinforced outer layer

　　- Contains an antimicrobial product protection additive

　　- Traps mineral deposits from the water