This document discusses hydrotherapy equipment and its uses. It describes how hydrotherapy uses water at different temperatures and in different ways to treat diseases. Some key pieces of equipment discussed are contrast baths for pain relief and edema reduction, whirlpool baths for mobilizing stiff joints and open wounds, and Hubbard tanks for underwater exercises for patients unable to stand. The document outlines the properties of water that make it useful for hydrotherapy like buoyancy, hydrostatic pressure, and viscosity, as well as various indications and contraindications.