Hot tub
Water safety in buildings, published by the World Health Organization in 2011, defines hot tubs as: ‘Facilities that are designed for sitting in (rather than swimming); contain water usually above 32 °C; are generally aerated; contain treated water; and are not drained, cleaned or refilled for each user. Hot tubs are also called spa pools, whirlpools, whirlpool spas and heated spas.’
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