Upgrade your indoor air quality with the Protec WF2 Humidifier Filter. Designed to work with the Vicks Extended Life Cool Mist Humidifier, this replacement filter pack includes 2 white cartridges. The filter's unique features make it an ideal choice for maintaining optimal humidity levels in your home or office. The application of this filter is not limited to Vicks humidifiers only, it can be used with any humidifier for better air quality.