The aim of these volumes is not to cover all phases of ion-exchange theory, which may be found in general texts, nor to cover every application in the literature, or to show an engineer ways on how to become an expert in the field so he coulddo it all by himself. The main purpose of these books is to show the practical engineer what has been done in various types of applications of ion-exchange processes in pollution control, how to set up laboratory tests, the problems that may be encountered to identify the individuals and organizations who are experts in the various phases of ion exchange, and most importantly, to emphasize the new developments in the polymers with active sites that offer new approaches to wastewater treatment methods.