The Bissell Rewind PowerHelix and its unique Helix Dirt Separation System captures dirt and other debris for even greater performance, whether you"re cleaning carpets or bare floors. It does this by using the internal ribs incorporated into the Easy Empty Dirt Container to force large dirt particles, dust and other debris down to the bottom of the tank, where they belong. This helps to protect the motor and extends life of filters so the vacuum works more effectively, longer. The Helix System, combined with the auto cord rewind for easy storage, makes for powerful and convenient cleaning.