The Alen T500 Tower Air Purifier 3-Pack offers up to 1500 square feet of coverage with extra savings. Each unit includes your first, easy to replace HEPA-Pure filter. The Alen T500 includes an easy to replace HEPA-Pure Filter with Pre-Filter 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. Air then moves through a unique, HEPA style material that attracts and captures up to 95% of dust, pollen, pet dander, mold spores and other airborne pollutants. Versatile filter options are available to address bacteria, mold, odor and smoke concerns. The T500's ozone-safe Ionizer complements the HEPA style filter by charging particles in the air, causing them to stick together and become more easily captured.