Extend the life of your MistAire or MistAire Silver Ultrasonic Cool Mist Humidifier (Models: PEHUMIDIF and PEHUMGRY) with the MistAire Humidifier Decalcification Cartridge Filter. This easy-to-install filter reduces mineral buildup and the formation of white dust in your water tank. Reduces the release of white dust caused by minerals in tap water Easy to install and remove Designed for use with Pure Enrichment's MistAire and MistAire Silver Ultrasonic Cool Mist Humidifier For best results, replace filter every 2-3 months