Abstract: A retrofit whirlpool bath is described which includes an oblong tub having inwardly tapering side and end walls. The end walls each have a back supportive surface and each are provided with a wedge shaped recessed surface. One of the end walls is also provided with a vertical, semi-tubular recessed surface intersecting the wedge shaped recessed surface. The recessed surfaces include apertures receptive to water jet nozzles and are designed to enhance the pressure and turbulence of water flowing from the nozzles and to distribute the turbulent water against the back of a person reclining against the supportive surfaces.