The Litter Robot takes a variety of litter. I've only tried clumping types like World's Best Cat Litter and also a different brand of clumping pine litter, and they all worked out fine. I replace the bottom drawer's bag twice a week, and completely change out the litter every 2-3 weeks. It is a bit hard though to empty out all of the litter in your Litter Robot if you accidentally overfill it, which I've done a couple times. It's amazing though to not have to scoop and clean out the old fashioned way, so I do recommend it!
Cons: easy to overfill, slightly loud, a bit pricey, rather large (for a litter box), awkward to move (when cleaning the floors, for example)
Pros: accurate sensor, accommodates a variety of litter types, large enough for bigger-sized cats, no more scooping!!!! (this one for me outweighs all of the cons :) )
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