CupriSorb is a powerful adsorbent of copper and heavy metals. CupriSorb will remove copper more rapidly and efficiently than carbon and is ideal for emergency copper removal. CupriSorb is a copper specific chelating resin. Competing products are not chelating products, but merely cation exchange resins. Such resins can remove copper from freshwater but are ineffective in saltwater. It extracts all types of copper, including chelated copper, and the media changes color to a deep blue-black color, making it easy to tell when itâ€™s exhausted.