Abstract: To provide a single structured sink unit in which, selectively, household refuse can be separated into garbage (which is biodegradable) and trash (which is not biodegradable), the sink unit is formed with two aligned openings (4, 5) positioned front-to-back. The second opening may have, selectively, a refuse chute (11) inserted therein or a basket (12), for example for cleaning supplies or the like. The openings are alignable with either separate refuse containers (9, 10) or a single container which is compartmentalized, for selective placement of separated trash and garbage or for unseparated refuse.