The Catit Smart Sift (self-cleaning litter tray) is designed to work with various types of litter, but sand or silica litter is recommended. The use of wood chip pellets is not explicitly recommended by the manufacturer, as these pellets may not pass correctly through the litter tray's sieving system.

It is therefore preferable to use the types of litter suggested by the manufacturer to ensure optimum performance of the product.