i made some quick and dirty anecdotal observations of Diatomite (aka Floor Dry), Oil-Dri, and Special Kitty (warning: zero science alert!). of course, your results may vary depending on batch, bag, sample from bag, planetary alignment, etc. ad nauseum. all were run through aluminum window screen. some thoughts:
- all pass some product through screen, but in the small amounts i did, i don't see major differences in %, all are ~10%, which is way less than than what i hear about turface. what passes through is not primarily dust, more like small granules that remind me of fine clumping kitty litter.
- dustiness: kitty litter is least dusty, diatomite was most dusty, but the oil-dri sample was old so i cannot fairly judge its dustiness; it did not spew as much dust into the air as the diatomite, but it had the finest particles in the sift (you can see that in the photo) so i suspect it can probably be pretty dusty when new. i guess it makes sense that the kitty litter would be least dusty since people get excited about that sort of thing in their houses and some of the brands mention it in advertising (this one says 'low dust' on the bag).
- size consistency: diatomite wins by far, kitty litter is the biggest loser, oil-dri in between. you can see in the pic that diatomite has the smallest average size (1/8), then oil-dri (3/16), and kitty litter is all over the place. that's a BB (3/16) in the center of the pic.
that's kitty litter at 2 o'clock, oil-dri at 6, and diatomite at 10. the big pile for each sample is some of what stayed on the window screen, the small pile is some of what went through.