A changing table is provided for engagement to a playard that includes at least one top rail. This invention provides a natural waste material, specifically avocado seed, its preparation and use for the filling of columns used in the elimination of contaminants present in wastewater. The chest support may further be adjustable for positioning substantially between a collarbone portion of the body and a xiphoid process portion of the body when the body is in a side rest position. After the first period of time, the flowing vaporized precursor stream is directed to flow into the chamber with the substrate therein under conditions effective to chemical vapor deposit a layer over the substrate. When the pocket door is in its closed position, the door perimeter overlaps the bulkhead on at least three sides of the door and also overlaps with the floor.