Water therapy, also known as hydrotherapy, is a special type of physical therapy which uses water for pain relief. Hydrotherapy is practised at a number of health and medical centres around the world, and is used to treat illness and various physical conditions.
In modern times, it has also become possible for people to enjoy water therapy in their own homes, with the help of outdoor whirlpools (Aussenwhirlpool) , hot tubs, and other domestic spa products. Water has often been used to treat physical conditions, with a long history of water therapy all around the world. Special whirlpools and spa baths are also used in relaxation centres and spa resorts, due to their relaxing and rejuvenating qualities. Outdoor whirlpools are widely available from manufacturers and pool suppliers, with products descriptions and images readily available on the Internet.

Various forms of water therapy have been used for thousands of years, with evidence of hydrotherapy in ancient Egyptian, Greek, and Roman times. Egyptian royalty were known to use essential oils and flowers while bathing, in much the same way as modern health centres. Hippocrates recommended and prescribed bathing in natural spring water as a way to treat a variety of sicknesses, with similar evidence also coming from ancient Chinese and Japanese cultures. In many ways, modern whirlpools and spa products attempt to imitate the action of natural spring water holes and whirlpools, through the use of air jets, bubbles, and moving flows of water.

Whether it is a serious treatment in a health clinic environment or simply a way to relax, the use of water as therapy has a long history throughout a number of human civilisations. The use of spa baths and outdoor whirlpools in domestic homes has helped water therapy to become even more popular in recent times, because it is something people can do easily and cheaply in their own environment. When searching for a spa bath to install in your home or garden, there are a number of things to keep in considerations, including the size, the price, the materials used, and the action of the water. Outdoor whirlpools and other spa products can be easily researched on the Internet, through home improvement websites, consumer forums, and the websites of commercial manufacturers.