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The claim. Dyson says that its 15.8-pound Slim DC18 upright vacuum cleaner, $470, is "the most powerful lightweight vacuum" and "doesn't lose suction." The company credits "cyclone technology" that uses "centrifugal force to spin dust out of the air."
The check. We weighed a clean carpet and an empty Dyson, ground a premeasured mix of sand and talc into the carpet, vacuumed, and weighed carpet and vac again, to see how much dirt had been picked up. To test suction, we measured airflow when the Dyson was empty and again when it contained finely ground sawdust. We also tested two other lightweights-the Hoover Tempo Widepath U5140-900, 16 ...