Yesterday when demonstrating an Electrolux Vacuum Cleaner I couldn't believe the difference in Suction power when I put a Brand New HEPA filter on the back of the machine. This lead me to think that too much Filtration is overkill and can defeat the purpose of vacuuming.
The purpose of vacuuming has always ben to take the dirt out of the carpet. Of course it is a great idea to have good filtration on the vacuum to prevent putting the air back into the room. But if you have to mch filtration and it is effecting how much dirt you are taking out of the carpet, do we realy wan that much filtration? If the filters are allowing the dirt to stay in the carpet than the dirt will just end up in the air anyway.
Yes, it is important to have good filtration in your vacuum but the most important thing the vacuum should do is PICK UP THE DIRT!