We recommend using small animal litter, fine wood shavings (such as Aspen Bedding), sawdust, coffee chaff, organic peat moss, coconut coir bricks, or Terra Preta/humus/soil. Feel free to experiment with different materials to find which litter best suits your needs and preferences. Please avoid conventional cat litter. It’s less absorbent, contains chemicals and fragrances, and forms lumps. Similar to small animal litter, organic cat litter is made from plant fibres such as wood or corn and can also be used as litter for composting toilets.