Quickly:
To avoid dust:
1) hoover around the canister after packing
2) or via direct system and a "soufflette" flush under air pressure all the dust, you'll be surprise of all the shitty dust of the sofnolime
better out in the air instead of in your lungs
PS: Aldo, your unit is too shiny, come cave diving to scratch it a bit in narrowness
Good day
Jerome