Hi
Umm when it comes to bicarbonate of soda I'm not sure is the honest answer.
I'm guessing it's how often you use it plus the amount your picking up.
If you use it allot in a cyclonic vacuum it might have a bigger impact than a decent bagged machine. Especially if the cyclonic machine is not well maintained when your using it with bicarbonate of soda or other fine/finer powders.
James
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