PrettyLitter is not biodegradable. However, silica gel crystal litter is less harmful to the environment than most cat litter brands since it doesn’t release toxic chemicals or dust.
The silica gel crystals litter is made from natural materials. But the heat, oxygen, and moisture added to silica sand to create the silica gel don’t biodegrade due to its composition. It’s also not compostable. Depose of used PrettyLitter in the trash.