A spa construction for use by humans comprising a shell for containing water and having a well for receiving the feet of the user. A seat is provided adjacent the well upon which the user can sit. A side wall is provided against which the user can rest his back. A first pump is provided having an inlet...http://www.google.es/patents/US4233694?utm_source=gb-gplus-sharePatente US4233694 - Spa construction and isolated controls therefor
