Porous Bag

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The porous bag keeps the vacuum alive throughout the cleaning process. This bag is responsible for holding all debris while filtering out clean air, essentially the purpose of a cigarette filter, but on a much bigger scale. This clean air is pushed through the exhaust port and keeps the vacuum running smoothly. 

The Physics of It

The pores in the bag are so miniscule that no dust is able to filter through. Instead, only clean air particles pass by. This leaves the vacuum clean, healthy, and ready to go.