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The oxidation reduction (redox) is one of the most comman reaction occuring in the nature. Redox media remove dissolved gases such as chlorine, hydrogen sulfide from water. They can also remove virtually any soluble heavy metal, help prevent mineral hardness. The mean values of trace metals at the four site was ranged as ug/l; for Hg 3.9-0.2, Pb25.6-0.98, Ni 22.1-1.58, Fe33.5- 1.44, Cr 66.5- 0.98, As 44.5- 0.75, Co 39-0.39, Cu 25.5-2.56 and for Cd 0.54-0.02 ug/l respectively.
