Spa Choice Re-Energize is an oxidizing spa shock. Re-Energize oxidizes organic contaminants such as ammonia, perspiration, and suntan lotion. Re-Energize also removes chloramines and bromamines which cause "chlorine odor" and enhance the sanitizing effectiveness of chlorine and bromine by reducing the formation of new chloramines and bromamines. Re-Energize also increases the clarity of spa water and reduces eye burn.