Description Join the Filter Club to receive an extended 5-year warranty, filters when you need them, and a discount. Designed for the HSP001 Smart True HEPA Air Purifier, we now offer Medical Grade H13 HEPA replacement filters. Superior to standard true HEPA filters, H13 medical grade HEPA can filter over 99% of particles down to 0.1 microns. These smaller particles make up the majority of harmful airborne pollutants like virus carriers, bacteria, and tobacco smoke.  Filters 99.97% of particles as small as 0.3 microns and 99.95% of a particles down to 0.1 microns in diameter.  Captures pollen, dust, mold, pet dander, pet hair, virus carriers, VOC's, smoke, odors, and other toxic chemicals.  Features 4 filter stages: Medical Grade True H13 HEPA, Antibacterial, Cold Catalyst, & Activated Carbon. Designed for easy installation, you can have your filters replaced in just a few seconds. Replacement Instructions When Should I Replace My Filters? We recommend changing every 4 months to maintain optimum performance.  If you need any help, feel free to reach out to the Hathaspace team. Package Contents 1 H13 HEPA + Antibacterial Filter 1 Cold Catalyst + Activated Carbon Filter