Chemical process for removing organometallic compounds from water

In a chemical process for selectively removing organometallic compounds from water supplies where said organometallic compounds contain an element selected from the group consisting of arsenic, cadmium and zinc, the improvement comprising adding to said water supplies, a combination of metals consisting of a transition metal selected from the group consisting of nickel, copper, iron and zinc, and an electropositive metal selected from the group consisting of magnesium and aluminum, one gram of each metal in said combination being added to about 20 mL of said water supplies to react with said organometallic compounds, and removing said organometallic compounds and said combination of metals from said water supplies.