A litter box described herein includes a main compartment, a contaminant compartment, and a grate separator dividing the main compartment and the contaminant compartment. The main compartment is above the grate separator and the contaminant compartment is below the grate separator. Powderizable litter in the main compartment is supported by the grate separator when the powderizable litter is in a large initial form. The powderizable litter in the main compartment drops through the grate separator into the contaminant compartment when the powderizable litter transforms to a small powder form leaving clean powderizable litter in the main compartment.
