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A hot tubis a large manufactured tub or small pool full of heated water and used for soaking, relaxation, massage, or hydrotherapy. In most cases, they have jets for massage purposes. They are usually located outdoors, and are often sheltered for protection from the elements, as well as for privacy.There are two different styles of hot tubs: Simple wooden-staved soaking tubs Fiberglass-reinforced plastic tubs (usually referred to as "spas") Hot tubs are usually heated using an electric or natural gas heater, though there are also wood-fired hot tub heaters. Hot tubs are also found at natural hot springs; in this case, the water may be dangerously hot and must be combined with cool water for a safe soaking temperature. Water sanitization is very important in a hot tub, as many organisms thrive in a warm, wet environment. In addition to the use of a pump and micrometre-range particulate filter, bromine or chlorine are used as a primary sanitizer, and often supplemented with an ozone generator and/or UV sterilization. If ozone and UV are not used, a primary algaecide such as polyquat may be additionally needed, since these microbes are more resistant to chlorine than are most bacteria. |