Nyantomo Purr Fect Potty Open Box Starter Kit Keep your home odor-free for a full week without changing the litter (when used by one cat) Your cat and your nose will love it. #1 selling Cat Litter in the "Two Layer Type" Litter Category in Japan.* *Source from INTAGE MPI data (7/2011 - 6/2013), "Two Layer Type Cat Litter" Category, Accumulative Value base The Nyantomo System makes it easy to check your cat's urine; By removing the pads, you can easily collect a urine sample in the empty pullout tray Nyantomo is a product of Japan and is currently only available at Amazon.com