Breathe in fresher air using the 2-in-1 True HEPA replacement filter from Pure Enrichment. Enjoy improved air quality as the premium 2-stage filter safely cleans the air in any home or office. Our filter is designed to work with the Pure Enrichment PureZone Breeze Air Purifier (sold separately). Each of the two layers of this filter provides a unique level of cleaning: Activated Carbon Pre-Filter– Captures and absorbs initial dust, allergen particles, formaldehyde, benzene, and other noxious gases. HEPA Filter– Captures dust, smoke, pollen, and other allergens. For optimal performance, we recommend replacing your unit's air filter every 6 months.