<Table> <Tr> <Td> </Td> <Td> Some of this article's listed sources may not be reliable . Please help this article by looking for better, more reliable sources . Unreliable citations may be challenged or deleted . (December 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Some of this article's listed sources may not be reliable . Please help this article by looking for better, more reliable sources . Unreliable citations may be challenged or deleted . (December 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> A hot tub is a large tub or small pool full of heated water used for hydrotherapy, relaxation or pleasure . Some have powerful jets for massage purposes . Hot tubs are sometimes also known as spas or by the trade name Jacuzzi . </P> <P> In contrast to a typical bathtub, a hot tub is designed to be used by more than one person at a time, with many models accommodating four people . Hot tubs are usually located outdoors, although they can be installed indoors . Also, the water in a hot tub is not changed with each use, but is kept sanitary using methods similar to those used for swimming pool sanitation . Another difference between baths and hot tubs is that soaps and shampoos are not used in wet - jetted hot tubs (although they can be used in air - jetted hot tubs). </P>

What is the difference between spas and hot tubs
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