This book will present the fundamentals of greywater and related topics such as separation, characterization, collection, transportation, storage, use options, guidelines, and standards. It will examine basic fundamentals and theory, and then present the technical issues of selection, design, construction, installation, operations, and maintenance of greywater. The different types of pollutants in greywater will be discussed as well as the latest treatment options. It will also include examples of mathematical problems, typical solutions, and case studies, and also cover cost-benefit analyses of greywater treatment and reuse projects, and help determine the best economic options.