Jack’s Magic The Sapphire Stuff is a great choice for any pool owner looking to prevent scale, staining, scum lines and foaming while getting crystal clear water quality. Its powerful 4-in-1 liquid formula combines a clarifier, flocculent, chelating agent and sequestrant to quickly group together microscopic contaminants into large enough particles to be trapped the pool filter, while being much easier to apply than granular alternatives. Best of all, The Sapphire Stuff is compatible with all types of sanitizer systems, making it safe for use in any pool.