GENUINE HEPA PURE REPLACEMENT FILTER: Our 360 degree HEPA Pure Replacement Filter is meticulously designed to capture up to 99.97% of harmful germs, dust, pollen, mold spores, and other allergens as small as .1 micron. REDUCES ODORS: The activated carbon pre-filter traps dust, pet hair, and other large particles, while extending the life of the HEPA filter. Treated carbon absorbs volatile organic compounds from the air and reduces odors from smoking, wildfire smoke cooking and pets PURER PARTS, PURER AIR: Genuine Germ Guardian replacement filters offer certified fit and maximum filtration. Off-brand filters often fail HEPA testing standards, fit incorrectly, reduce efficacy, and may cause damage to the air purifier. REFRESH TO IMPRESS: We recommend replacing one single combination filter every 6 months depending on the use of the product. The carbon layer, Model #FLT15CB4, can be replaced every 2-3 months to help reduce common pet odors and extend filter life. COMPATIBLE WITH: GermGuardian Air Purifier Models: AC3000W, AC3000B, AC3050, AP3151, AC151