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PUREFLOW 2016 Audi A8 Quattro Cabin Air Filter with Antibacterial Technology, PC4439X QX60 2016 BMW Alpina B6 Gran1st Stage: Particulate filtration media captures and eliminates matter such as dust and pollen. Electrostatically charged to attract and lock fine particles of dust while allowing high flow and high capacity. 2nd & 3rd Stage: Activated charcoal adsorbs harmful gases like carbon monoxide and sulfur dioxide. This layer is combined with baking soda to absorb bad odors. 4th Stage: Advanced antibacterial micro technology reduces biofouling by suppressing