This premium high-efficiency H13 True HEPA Filtration System is only compatible with *Pure Enrichment’s PureZone Air Purifiers. This True HEPA Filter System contains 3-Stage filtration: <br> <br> -<b>Pre-Filter: </b> Traps larger particles in the air like dust, hairs, pet fur, lint and more<br> -<b>Activated Carbon Filter: </b> Absorbs household odors from pets, cooking, smoking and harmful VOC’s<br> -<b>H13 Grade True HEPA Filter: </b> Captures 99.97% of airborne particles down to 0.3 microns in size <br> <br> Using high efficiency air cleaner filters and replacing the filters regularly will help optimize air cleaning performance. Replace your 3-in-1 True HEPA Filter System every 6 months for optimal performance. <br> <br> <br> <br> Disclaimer: <br> *Pure Enrichment and PureZone are the registered trademarks of the original manufacturers. Any use of Pure Enrichment and PureZone brand name and model designation is made solely for purposes of demonstrating compatibility.