
The underlying operating principle is quite simple. A circulating pump runs a water cycle. The body-temperature water is canceled by the tub (usually) several times, filtered by a heater kept at constant temperature and then through various nozzles (technical term: Jets) again passed into the whirlpool . These nozzles are placed so that they massage different Körperregionan. In modern spa is placed under the water the air to the jet to make it softer. Often this function can be controlled dynamically. The current models also have a very good insulation.
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