The problem with the filtrete bags...
is the same as the problem with HEPA filtration material being tested separately from the vacuum in which it is to be used. The number of dirt paticles per unit of air at a given rate of flow.
The electrostatic material can only capture so much. Exceed its capacity and there will be dirt escaping. Look at the old Airway bags, 28 layer filter paper in a metal cage. Excellent filtration, and the motors were always clean, even in very old machines.[this post was last edited: 3/22/2012-09:17]
