The upgraded WF2 humidifier filter features an improved mesh structure that effectively filters out hard minerals from water, helping to prevent white dust from entering indoor air. Compatible with Honeywell 3000 series models: V3100, V3500, V3500N, V3600, V3700, V3800, V3850, V3850JUV, V3900, VEV320. Also compatible with Honeywell HCM630, HCM631, HCM645, HCM650, HCM300T, HCM350, HCM1000, HCM2000, HCM540; SCM1118, SCM1119, SCM1120. High-efficiency filtration: The WF2 filter uses an advanced honeycomb carbon design for increased surface area, enhancing moisture absorption and overall humidifier performance. For optimal performance, use only distilled water and replace the filter every 2–3 months. Regular replacement maintains clean air quality and extends the humidifier's lifespan. Material: Filter cotton Color: White Package includes: 3 x humidifier filters Note: Color may vary slightly due to screen settings or lighting. Dimensions may vary by ±1–3 cm.