GLB Super Sequa Sol is a concentrated, granular sequestering agent that prevents staining, scale, and rust on pool equipment, pipes, and fittings. This product is formulated to protect pool equipment. Its powerful formula holds minerals in solution even in chlorine, bromine, and strong UV sunlight. Super Sequa Sol is great for use at the beginning of the season or any time a large amount of make-up water is added to the pool. This product is compatible with chlorine, bromine, biguanide, ozone, and salt water sanitizing systems.