This book will provide you with all the information you need to know about hot tubs and spas, whether you are looking to buy one or already own one. It will help you to determine what you want and what you need, how to install it, clean it, and control the settings. You will learn about the health benefits of hot water, including hydrotherapy, aromatherapy, reflexology, chromotherapy, and Watsu. You will also learn about soft sided spas, acrylic spas, cabinets, pumps, flow rate, skimmers, suction ports and drains, jets, special waters, covers, ozonators, heaters, permanent spas, blowers, spa packs, plumbing issues, alkalinity, water hardness, temperature, sanitizers, oxidizers, water analysis, the pH scale, and test kits. Also included is a discussion of cartridges, including sand and diatomaceous earth (DE), and water chemistry. Additionally, it will provide you with tips for buying, realistic cost estimates, winterizing, and upgrade options, plus tricks and tools of the trade. --Adapted from back cover.