Abstract: A cat litter-tray for collection and disposal of cat excreta having a tray in which a layer of granules is disposed. A sensor, connected through a delay-timer to a programmer, senses the presence of a cat. The tray includes a door mechanism having a mechanism for hermetic sealing and re-opening of the tray, a water inlet for providing water onto the granules, an air heater for heating granule drying air, a detergent reservoir, a water heating element, and an electric pump for circulating water into the granules through a plurality of nozzles supported on the base of the tray.