StainEraser Inc. - Pool Stain Eraser Vanish Stains from Concrete Pool Plaster Spa Surfaces. This Stain eraser vanishes stains without scratching damaging or gouging your pool surface. Made from a proven patented formula that will not damage your pool or plaster spa surface. Provide instant results. Simply erase stains away. Rough surfaces may reduce the life of this product. Not recommended for vinyl surfaces. Erase It grinds the calcium off the tile while polishing the tile without damaging it! Rough surfaces may reduce the life of this product. Size 12.3 x 0.8 x 3.5 inches. Weight ‎2.05 pounds. White The...