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7,100 liters is about ten times as big as a Hot Tub
In other words, it's 9.870 times the size of a Hot Tub, and the size of a Hot Tub is 0.1010 times that amount.
(for Lifesmart Rock Solid Simplicity Plug and Play 4 Person Spa With 12 Jets) (a.k.a. Spa, a.k.a. Jacuzzi, a.k.a. Whirlpool) (Advertised Capacity)
An average, four-person hot tub holds 719 liters of water. Modern hot tubs became popular outside of Japan starting in about 1940.
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