Allergy Be Gone Holmes HWF100 Humidifier Filter with Antimicrobial Protection Improves efficiency of the humidifier Extends product life as less mineral deposits will attach to the unit Works with models HM630, SCM630, BCM646, HM7808, SCM7808, BCM7205, HCM730, BCM7305, HCM729G For optimum performance, replace filter at the beginning of each season or every 2 months depending on use 100% fresh air and satisfaction or your money back. Crafted by Allergy Be Gone.