This is the litter box system that naturally eliminates odors. Unlike lesser litter boxes that only mask odors, this system uses a replaceable pad filled with zeolite—an inert organic mineral—to absorb moisture, bacteria, and ammonia-infused odors associated with litter box waste. The pad keeps a home free of unpleasant aromas for up to 30 days with ordinary litter box use and maintenance. Adhere the pad to the bottom the box, place the included grate over it, and fill with 3" of your preferred clay or sand clumping litter. 7 1/2" H x 18" W x 20 1/2" L. (5 1/4 lbs.)