Pile Lifter Vacuum: The Pile Lifter works on both a sweeping and a vacuum action. The 4.5 inch brush gets down to the base of the carpet fibers to break-up caked, embedded soils and dry particulate matter, which are swept by the brush into the sand trap area. Once in the sand trap heavy particles such as pebbles, paper clips, sand, and tacks rest in the sand trap. The vacuum motor then pulls the smaller, lighter particles into the vacuum bag.