Automatic litter boxes work through different mechanisms designed to take any lumps out of the litter box. So this includes clumps of litter where your cat has peed or pooped.
Litter-Robot 4 is the latest in the Litter-Robot line. It offers significant improvements over earlier models thanks to its QuietSift cleaning cycle and the excellent OdorTrap feature, which minimizes smells.
The Popur X5 suits bigger cat breeds and has a large, open design. It uses an advanced rake with an accordion-style lifter to drop the waste into the box once the lid is automatically opened.