Sodium ascorbate (vitamin C) is particularly useful for dechlorination of large tanks due to its quick dissolve rate. Its viability as a substitute for sulfite dechlorination is only an economic decision as its benefits are clear on an environmental basis due to the tendency of sulfites to deplete oxygen. When compared with ascorbic acid (also vitamin C), the neutral pH of sodium ascorbate makes it the preferred option for treating large volumes of water that contain high levels of chlorine (>10 ppm).