Abstract: A spa system particularly adapted for installation as part of a bathtub within the home. The various jets are fed recirculated water from a pump by individual lines from a manifold to assure equal output regardless of its distance from the pump. The jets are venturi-type jets of the type to aspirate and entrain air in the output stream. The jets are connected to an adjustable air inlet system designed to allow adjustment of the air being aspirated into the water stream as well as preventing undesired water splash or spray therefrom in the event of jet blockage.