The Disposable Plaster Trap is a convenient and sanitary means of reducing residue and sediment from plaster slurry water discharge. The Trap acts as a sediment tank that permits plaster residue to collect therein. When full, the disposable container is replaced with a new container. Hoses plug into and out of successive containers for swift and easy maintenance. Provided snap-caps fit onto the spout openings of the used container enclosing the contents and allowing for convenient disposal.