HEPA style replacement filter with Pre-Filter for dust and allergen removal and a thick layer of Activated Carbon for chemical and odor control. Designed for the Alen BreatheSmart Air Purifier, the Alen HEPA-FreshPlus Filter combines three layers of filter technology to purify and freshen the air in your home. Polluted air first passes through Alen's washable Pre-Filter to capture large particles, extending the life of the filter. In the second layer, air moves through a unique, electrostatically charged HEPA style material that attracts and captures dust, pollen, pet dander, mold spores and other airborne pollutants. In the final layer, clean air passes through a thick layer of Alen's Activated Carbon (3 lbs), reducing odors and chemicals commonly found in the air from cleaning products, smoke, cooking, pets and various other household materials. Save time and money with Alen's AutoShip Filter Plan. Get FREE Shipping on filters (valued at $15 or more). Your first filter ships immediately. Future filters are auto-billed and shipped FREE, based on your desired frequency. Cancel at any time. Join AutoShip and start Living Betternow.