Everything that you need to get started comes with this set. Set up was easy and fast. At first my cat was a little hesitant since it is much bigger than his old litter box. He now uses this one and I couldn't be happier. It works great at getting the solids out and into the tray. The liquid is easily absorbed into the cat litter and it is great at hiding the smell. This definitely is a time saver. The only draw back is having to buy the trays monthly although they are affordable.