To transition your cat to use Feline Pine Non Clumping Natural Pine Cat Litter:
Phase 1: Pour one inch of Feline Pine into a clean litter box. Next, pour one to two inches of your old litter brand on top. Do not mix—your cat will mix this naturally as she uses her litter.
Phase 2: The next time you change the litter box, fill with one inch of Feline Pine and a lesser amount of your old litter brand. Repeat this for another three to four litter changes, lessening the amount of your old litter each time.
Phase 3: Fill litter box with one inch of Feline Pine. At this point, your cat should be acclimated to Feline Pine but some cats do need a little more time.