GLB Sequa Sol is a fast-acting sequestering agent which holds iron, manganese, copper, and calcium in solution so they don't react with other chemicals in the water. Using this product at pool set-up and as part of a regular maintenance program will protect pool equipment, pipes, and fittings. Sequa Sol provides fast and effective protection against pool staining and scaling. It is compatible with chlorine, bromine, biguanide, ozone, and salt water sanitizing systems.