Neatforbaby Cat Litter Disposal System Refill Cartridge Cat litter Disposal system refill for use with the Litter Cat Litter Disposal System 50% extra bags in each refill due to patent improvement, If you have more than 1 cat, you will be surprised on how much you will be saving. Each refill lasts up to 12 weeks, that is 3 months for 1 cat, and 3 refills last up to 9 months! More bags in the refills means more environment friendly; you will throw away less cartridge, No risk to try. We offer replacement or refund guarantee policy if you are not completely satisfied