Abstract: A whirlpool bath assembly with a recirculation pump fed from the bath by a suction pipe and then to venturi jet units through by system feed pipes. Further air pipes feed the venturi jet units. A drain-off valve connects the pump through a drain pipe to a waste-water drain. All the units forming the assembly are constructed so as to provide a gravity drain-off into the bath and drain pipe. This is done by ensuring that height of the surfaces over which drain-off water flows when the assembly is inoperative reduce continuously without forming any water retaining recesses.