Litter Box ARIEL(TOP FREE) with Cat ClipartHooded toilets are better for you and your cat. As well as offering privacy the Ariel also helps to reduce odours with its swing door and large, replaceable carbon, charcoal filter. The open front design is perfect for modern crystal and clumping litters where you just remove the solid waste and clumped litter each day rather than the whole tray. The lift up front simply makes these quicker and easier. The base is deep with a high back.