Sodium hypochlorite, NaOCl appears as colorless or slightly yellow watery liquid with an odor of household bleach. Mixes with water. Sodium hypochlorite is generally used dissolved in water at various concentrations. Although available, solid sodium hypochlorite is not commercially used. Sodium hypochlorite solutions are clear, greenish to yellow liquids with an odor of chlorine. Due to its strong disinfection, NaOCl is used in water treatments as an active ingredient, also in purification, bleaching, odor removal or pulp and paper bleaching.