This lesson incorporates a scientific investigation of the properties of salt water. Students investigate the salinity in different types of water and ways that salt and other particles can be removed from drinking water. We recommend reading Chapter 3, which is included in this book selection and provides a module overview and summary. A materials list, safety notes, standards, teacher background information, assessment, and Internet resources are provided. This book selection also includes the Table of Contents, About the Editors and Authors, Appendix, and Index.