Today s hot tubs are usually small pools constructed of tile, marble, concrete, or fiberglass shell.
Water is heated and circulated through a pump and filter.
There are many reasons people like having a hot tub. The warm swirling water relaxes the body, reduces stress, and improves sleep. Pulsating jets of water soothe sore muscles. Hot tubs are also great centers of entertainment for family and friends. Standing pools of water can be breeding grounds for disease-causing organisms.