Reduction potential (also known as redox potential, oxidation / reduction potential or ORP) is the tendency of a chemical species to acquire electrons and thereby be reduced. Each species has its own intrinsic reduction potential; the more positive the potential, the greater the species' affinity for electrons and tendency to be reduced. Oxidation Reduction Potential (ORP) is an indication of a solution’s ability to oxidize or reduce another solution. It is a ratio of both oxidized to reduced species in a solution. Some commonly used oxidizers include chlorine (pools, spas, water treatment, bleach production, pulp bleaching, fruit and vegetable washing, poultry processing), ozone (commercial aquariums, water disinfection), bromine, sodium hypochlorite, and hydrogen peroxide. Examples of reductants include sodium bisulfite and sulfur dioxide.