I use the house brand from PetValu stores (I can't remember the name). It's a clumping litter and really absorbs odors well. I've never tried the crystals/pearls. I also swear by a LitterMaid automatic litter box cleaner. It has a cover and an enclosed disposable container for the solid waste so there's virtually no odor or dust. The LitterMaid has a carpeted ramp which leads to it's entrance and it really picks up the litter off of Bo's feet.