Caldera Spa Monarch Chlorine Granular 1.75 lb Item #74737 Description: Keep your spa sparkling clean with our fast-dissolving granular chlorine! Granular chlorine is one of the most popular forms of pool chlorine among spa owners Granular chlorine eradicates bacteria and other organic contaminants for clean, sanitized spas Chlorine granules are fast-dissolving. Features: Our granular pool chlorine leaves no residue. Ideal for use in spas, hot tubs and swimming pools. Simply broadcast chlorine granules into your pool or spa. 99.0% Sodium Dichloro-S-Triazinetrione. About Caldera Water Care Products: Caldera Spa’s efficient and simple hot tub water care systems make it easier than ever to keep the water in your hot tub fresh and crystal clear.