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R esults o f pilot testing indicate that, for the w ater quality observed at Magna, EDR provides e ffective removal o f perchlorate and the removal e fficiency o f perchlorate is similar to that of c hloride. Some sorption of perchlorate to the EDR i on-exchange membranes appeared to occur a lthough this effected brine perchlorate concent rations to a much greater extent than the product w ater. [1] H.S. Okamoto, D.K Rishi, W.R. Steebe, F.S. Baumarm and S.K. Pesem, J. AWWA, 91 (10) 73. [2] CaliforniaDepartment of Health Services, Division o f Drinking Water and EnvironmentalManagement, Perchlorate in Drinking Water, Sacramento, CA, 1997. [3] J. Carts and M.L. McCullough,Technologyscreening for the treatment of perehlorate in groundwater at Baldwin Park operable unit San Gabriel Basin, HardingLawsonAssociates,1997.