the brushes are for bigger stuff, the bin with the "teeth" are the main thing that suck up all the very fine dust. I can assure you that no vacuum cleaner is able to pick up as much fine dust as good as what a Roomba (I'm referring to 550 and above). I have a Dyson which is in retire mood since Roomba took over its responsibility![]()
Is 5series suppose to filter finer dust compared to 4series? Is it due to it's dust filter or its brushes?
can try other models.