The Clearwater Miracle Pad offers an upgrade on traditional magic sponges.The Clearwater Miracle Cleaning Pad offers a uniquE way to clean your spa. You don't need detergent or bleach due to the way the sponge becomes rough when exposed to water. This makes the pad fantastic for cleaning spas and pools since there is no need to use potentially harmful chemicals near the water, so you don't have to drain your spa or pool every time you want to clean it. Clearwater Pool and Spa Miracle Cleaning Pads - White