This is embarrassing because I can't remember, but I think it is the "Fresh Step" scoopable that I buy in those huge, heavy buckets. I buy it so infrequently because both of my cats are indoor/outdoor kitties and Mimi is the only one that ever uses the litter box. It is upstairs in my daughter's bathroom and I only buy it when she says it is time. It does not produce dust that I can tell, but those tiny little granules have to be swept up off the tile floor periodically because Mimi's scratching sends them all over the place!

I think if I made a big change, I'd probably do it like I would food and make the change gradual, just in case you encounter some resistance. Good luck!