Beachcomber Pure Blue is a highly concentrated liquid water clarifier. Through the process of ‘agglomeration’ (to gather together), Pure Blue can clear your cloudy hot tub water and restore its sparkle. Borrowed from the swimming pool industry, its formula is specifically designed for hot tubs to coagulate, or gather together suspended micro-particles in the hot tub water. It forms masses large enough to be caught by the Micro filter. The regular use of Pure Blue as a preventative measure will help keep your hot tub water clear and sparkling.