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Hi TreeClimber - re dangers of inhaling DE, yes, you're right, the food-grade type is not a problem. It can be liberally sprinkled on dogs, cats, rabbits to kill off fleas. No harm to them or yourself if you inhale some. Although, that has never happened to me, I just put it on their tummies and base of tail and there is no dust flying around.
The fleas aren't killed by breathing it in - but because the DE destroys their outer hard skin and once that is damaged they can't survive. In fact, that's how DE kills off all invasive insects such as ants, roaches etc.
BTW DE is not ground-up fishbone. It is a powder made from a sedimentary rock which was formed by the fossilized remains of diatoms, which are a sort of algae.
I'm the opposite to your mum - I don't even own a vacuum cleaner. I don't have carpets - just tiles.
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