A complete self-teaching guide for all water/wastewater treatment calculations, this book provides a thorough review of mathematical concepts and skills encountered in the daily operations of a water and wastewater treatment plant. Each chapter begins with a skills check to allow the student to determine whether or not a review of the topic is needed. Practice problems illustrate the concepts presented in each section. It serves as a step-by-step training manual that provides the concise, practical instruction in the math skills that operators must have to pass certification tests. The extensive use of graphics illustrates mathematical concepts clearly and concisely.