A bathwater circulating system has a pump operable to draw fluid in at an intake port and expel it under pressure at an output port. Water- and air-supply conduits feed water and air to the intake port at a rate determined by a flow-restricting air-intake valve so that the pump mixes the water and the air, pressurizes the mixture and thereby dissolves the air in the water, and expels the air/water mixture at the output port. A pressure-reducing valve is connected by an output conduit that extends from the output port to the pressure relief valve and conducts the water/air-bubble mixture from the pump to the pressure-reducing valve without separation of the air from the water and such that the mixture is at least partially depressurized at the pressure-reducing valve such that the air forms microbubbles in the water.

A method and a control panel are described for facilitating the control of a bathing unit system so that the bathing unit system is caused to transition between operating in accordance with a first operational mode to operating in accordance with a second operational mode. A control signal is generated in response to a unitary user input event performed by a user at a control panel of the bathing unit system, the control signal conveying an ambiance activation command associated with a specific ambience setting, the generation of the control signal comprising selecting the specific ambience setting from a set of ambience settings stored in a memory device. The control signal is then transmitted from the control panel to the controller over a communication link where it is processed to cause the bathing unit system to transition from being in the rest mode to operating in accordance with the specific ambience setting. The method and a control panel may allow simplifying the control of the bathing unit system in order to achieve a desired total effect by allowing a user to cause the bathing unit to operate in accordance with an ambience setting by way of a unitary user input event performed at the control panel.

A hot tub plumbing system is provided, the system including a plurality of water pumps respectively provided at different sides of a hot tub having a plurality of jets, and a plurality of manifolds each having an intake port coupled to one of the water pumps, and each configured to have a plurality of output ports respectively connected by tubing to one of the jets of the hot tub.

A control box of a massage pool is provided and includes: a filtering water pump unit, including a filtering pump body, a filtering water inlet pipe connected between the massage pool and the filtering pump body, and a filtering output pipe. The control box further includes a massage pump unit, including a massage pump body, a massage inlet pipe connected between the massage pool and the massage pump body, and a massage output pipe. The control box further includes a water outlet pipe configured to output water to the massage pool, and a three-way connecting pipe fitting. The three-way connecting pipe fitting includes: a first branch pipe having a distal end connected to the filtering output pipe, a second branch pipe having a distal end connected to the massage output pipe, and a third branch pipe having a distal end connected to the water outlet pipe At least one valve is configured to alternately open and close a first flow path from the filtering output pipe through the first branch pipe.