Vitamin C (ascorbic acid) removes chlorine by neutralizing chlorinated water. The chemical structure of vitamin C interacts with the chlorine found in tap water to create a non-harmful, mild hydrochloric acid. The result is slightly acidic but clean water, ideal for the development of your hair and skin. In addition, vitamin C is an environmentally friendly acid that reacts with limescale, making it water-soluble and harmless. Vitamin C is an acid similar to vinegar but much weaker. It can prevent soap scum from forming in hard water (i.e. water with a lot of minerals) by breaking down calcium carbonate into water-soluble compounds, water and CO2. This process allows your soaps and shampoos to do their jobs effectively and really cleans you.