A new ion-exchange material [based on poly(acrylic acid)] and some of its analytical applications have been reported. This paper contains data on the ion-exchange properties of the film form of the material and its potential application to the decontamination of wastewater and drinking water. The film has a high exchange capacity of 5-6 mequiv/g and a pK(a) of 5.7. The calcium form is the most effective for removing metal ions from solution, and the optimum pH range is between 5 and 7. The exchange rates are slower for the film form than for the bead and powder forms of the ion-exchange material; otherwise, the properties are similar. The film is effective when hard water solutions are employed and also when metal ions are in the complex matrix of wastewater from electroplating. The film can be used in flow systems having a flow channel large enough to allow passage of turbid solutions.