There is dirt and grime found throughout the product. The Blueair has been tested and it works. The Blueair Blue Pure 411 Auto HEPA Silent Air Purifier is a powerful and efficient plug-in air purifier designed for personal use in any room. With its HEPA filtration technology, activated charcoal, and activated carbon filters, it captures contaminants such as allergens, cooking oil smoke, dust, odors, and bacteria. It features three speeds, quiet operation, automatic shut off, and a filter replacement indicator for convenience. With a 210W power source and a filter life of 120 months, this white air purifier is a reliable choice to improve indoor air quality.