Abstract: A slide irrigating unit has two plexiglass boxes, an inner box forming an irrigating chamber and an outer box forming a drain box. The outer drain box is tightly sealed and its inner walls form the perimeters of the inner box which is open at the top. PVC tubing extends through the outer box and underneath the inner box. This tubing is attached to a fresh water source. The fresh water flows into this PVC tubing and under the bottom of the inner box. Water emerges from this PVC tubing through holes in the bottom of the inner box. As the water level increases in height, it rinses racks of stained microscopic slides that have been inserted into the inner box from the top. The inner box contains drainage holes approximately one inch from the top of the open inner box. The stain contaminated water rises from the bottom of the inner box and drains through these drainage holes into the sealed outer box. The stain contaminated water exits the outer drain box through a PVC drainage pipe in the bottom of the outer box.