I've tried just about every kitty litter, but Dr. Elsey's Cat Attract and Precious Cat are my favorites. They are both clay clumping litters. Precious Cat is cheaper than Cat Attract. The cats seem very happy with this choice too.
Here are others that I've tried and their benefits and drawbacks.
Scoop Away - good for clumping, bad because of the higher level of dust (it actually caused one of the cats to sneeze a lot)
SwheatScoop - good for clumping but the cats weren't as fond of it as clay litter
World's Best Cat Litter - it clumps, but the smell of wet corn got to be too much for me (I grew up on a farm and it really reminded me of some of the smells from that)
Feline Pine - the best for cats that are confined in large crates/kennels, it's much less messy than clay in that situation; the bad parts are that cats will use it but aren't exactly thrilled with it, and it's almost impossible to scoop; I also don't believe the part where a 20lb bag is equivalent to a 40 pound bag of clay
Yesterday's News - same problems as feline pine, but it might be a good litter in a crated/kenneled situation
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