Jack's Magic The Copper & Scale Stuff - Stain Solution #2, is a powerful stain remover and descaler designed for use in all pool types and surfaces. This solution effectively tackles copper stains and scale buildup, outperforming traditional acid-washing methods. Enjoy hassle-free maintenance as this product eliminates the need for hand scrubbing or pool drainage, saving you time and effort. To ensure safe usage, bypassing the heater is required. Enhance your pool maintenance routine with Jack's Magic, providing an efficient solution to keep your pool pristine.