And I use a very long bag when I empty the bin.That way you don't get so much dust blowing back up the tube I also hold the bag tightly around the bin to seal as much as possible then I don't come into contact with a dust cloud.
Okay, the entire cyclone assembly is clean and dust free and the filters were washed. Starting from tommorrow I am going to use the Dyson until the dirt gets to the max line which may take a day or two, this is without emtying of course. When the bin is full, I will take out the pre filter and look in the filter compartment, if there is no dust inside the housing of where the filter sits then I will be convinced that, the culprit is emptying the bin and dust statically raised up the tube.