What a difference these cat boxes make cleaning. Everyday I scoup and remove bad litter. The area stays undercontrol better then any other product we have tried. We also use a White 3' x 4'Washing Machine drain pain under each cat pan. They hold 2 cat boxes per tray. We have 5 cats and 4 boxes. The purpose of 3x4 pan is we have wood floors. This set up works great & boxes are awesome only litter from paws and pan under box catches that!