This is the BEST cat litter - no question about it! I've used the WBCT Original Formula and/or the Multiple Cat Formula exclusively since my two, now 14-15 year old, cats were kittens. I've found that a mix of the two formulas, in each of three large/jumbo size litter pails, at a minimum depth of 3-5 inches, works best. That depth yields clumps of urine, that don't stick to the bottom of the pail, and that don't break apart when lifted out with a sieve scoop. Tracking of the litter on the cats' paws is limited to within about 1-2 feet of the pail. Lasts longer than other litters and best of all, we have not had to worry about the ill effects of clay dust on our lungs!