I wouldn't say its "dust free". But greatly reduced over other substrates I've used. I really only notice "some" dust when I scoop it out of the bag. Our house stays fairly dry, with central heat/AC.
Once the substrate is in the tubs, that I maintain at a higher *but not wet* humidity, I do not notice any dust when disturbing it.
ReptiChip was dusty once I had it completely dried out. But not to a point where it became a problem. I noticed it most when scooping it up out of my bin, it made me cough a little and my arms were covered in fine dust. But again, once in the cages or tubs, the higher humidity kept it under control..
Reptile Prime is VERY light and fluffy, so sometimes the snakes just push it around rather then stay "on top" of it. But honestly, they did that with the ReptiChip, too, once it was dry..








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