Unlike a sequestrant, CuLator is a bag that drops in the skimmer and actually pulls the metals completely out of the water. CuLator rapidly removes copper, manganese, and iron, from pool and spa water. CuLator is a non-toxic product and works in fresh and saltwater pools. CuLator will not interact with any other pool chemicals. Simply place a pre-measured PowerPak bag in the skimmer. As water passes over, metals are trapped inside. After use, toss the biodegradable PowerPak with the bound metals away! CuLator does not add phosphates. Each PowerPak eliminates 1.0 ppm total dissolved metals from 20,000 gallons.