Overall, the results of these experiments indicate that crushed mussel shell is effective at capturing zinc and Copper in a flow-through situation at concentrations that can be experienced in stormwater. The results also indicate that the mussel shell has considerable overall capacity to capture and retain Zinc and Copper, with approximately 1 mg of Zinc and 0.2 mg Copper per gram of crushed mussel shell sequestered by the test column, with a continuing capacity to capture metals indicated.