I have 3 of these litter boxes. And after a period of 10 years only now have had to begin to replace them. These work great! Makes life so easy and clean. No scooping. Contains odors. Simple system. And once when I had an issue customer service was amazingly helpful and quick. I also get the subscription service for refills which helps so I never forget to order. I have 3 cats and change out the boxes approx 2x a month. Those two days are the only time I have to deal with or think about litter! And that’s great!