The Poolman Stain Eraser attaches to standard pool pole, rub on the stained area in the pool and watch it disappear. The StainEraser will clean most pool stains such as calcium, rust, algae, metal stains, paint and more. Remove stains on the pool surface without scratching, damaging or gouging to the surface. Made from a proven patented formula, it will not damage your pool or plaster spa surface.