An inflatable spa comprising:- a top wall (102)； bottom wall (104)； internal wall (106)； external wall (108)； inflatable air chamber (110) defined by the top wall, the bottom wall, the internal wall, and the external wall；- a plurality of tensioning structures (120) that each extend from the external wall to the internal wall through the air chamber；- a water cavity (112) defined by the bottom wall and the internal wall； and- a control system (22) including an air pump (232) operable in:an inflation mode that supplies air to the air chamber to inflate the air chamber； andan aeration mode that supplies air to the water cavity,the spa further including an air transport pipe (380, 780) in communication with the air pump in the aeration mode, the air transport pipe extending through the external wall, through the air chamber and through the internal wall toward the water cavity.
