Litter Genie Ultimate Cat Litter Disposal System Refills, Lock Away Odors, 12 Cartridges HASSLE-FREE ODOR CONTROL - When used with any Litter Genie Pail, seven layer refills with odor barrier technology lock away germs and odors from soiled cat litter for up to two weeks* (for one cat). *(XL Pails store litter for up to three weeks) TWO MONTH MARVEL - Everyday searching for plastic bags and frequent trips to the trash can are now a thing of the past. One refill cartridge lasts up to two months (for one cat). JACKSON GALAXY APPROVED - As a cat behaviorist for over 20 years, Jackson Galaxy, the official Cat Daddy, understands what it takes to create a happy home for cats and the people who love them. Litter Genie is a necessity (not a luxury) in his home and thats why he recommends this cat litter disposal system to all cat owners across America. EASY TO INSERT AND USE - To use in any Litter Genie pail, simply pull out a foot of film, push it through the center of the cartridge and tie a knot at the bottom. Then, open the lid and funnel of the pail, sit the cartridge on top, and push the refill through to the bottom. UNIVERSAL FIT- Never worry about having the wrong size refill cartridge. All of our refill cartridges are designed to fit all our pails, Standard, Plus, and XL, taking the hassle out of buying refills.