The HEPA Filter (191P31-7) is for use with the Makita 18V X2 LXT® Brushless Cordless Smart Robotic HEPA Filter Vacuum (DRC300, sold separately). It is an efficient HEPA filtration system that captures 99.99% of particulates .3 microns and larger. It is washable and reusable for extended filter life. The filter housing allows for quick and easy filter changes.