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The average vacuum can lose suction over time, leaving behind dirt and dust and totally defeating its own purpose. Vacuum manufacturers, like Dirt Devil, have upright vacuums with patented technology that offer sustained suction, thanks to its dual cyclonic action that takes air and separates the dirt, never allowing it to get to the filter. Because dirt never gets a chance to clog the filter, there is a better flow of air. This creates the consistent rate of suction so many have been looking for in a vacuum cleaner.