What the Hydro + Microbubble Schematic Shows: Two Pumps, a Pressure Tank, an LED Control Box and Two Dedicated Lines (Stainless and Outward Door Tubs)

This page explains the Hydro Therapeutic Massage + Microbubble Therapy component diagram published for Ella's stainless steel inward-swing door and outward-swing door walk-in tubs. It comes from the official schematic hydromicrobubblepdf_compressed.pdf, revision dated 01-16-26, which prints "Available With: Stainless Steel, Outward Door." The drawing shows two pumps, a pressure tank, an in-line heater, an ozone generator, a chromatherapy light with its own control box, and two dedicated electrical lines. If you want to understand what your electrician is wiring, or where to look when the bubbles stop, this is the map.

Which Tubs This Diagram Lists

The "Available With" box names two door families rather than individual models: Stainless Steel, meaning the inward-swing tubs with the brushed stainless steel and frosted glass door, and Outward Door, meaning the tubs with the plastic composite and tempered glass door that swings outward. Any model in either family that is offered with the Hydro Massage + Microbubble package uses this drawing. To see which models list that package, read therapy package combinations by model. The Front Entry has its own version of this diagram with fewer components.

The Six Numbered Components

The legend numbers six components, repeated here exactly as printed.

The first item is printed as "Hydro Foot Massage System," yet the drawing labels the pump it points to as the Seat Jets Hydro Pump. Read item 1 as the tub's hydro massage system; your model's spec sheet gives the exact split of seat, foot, and calf jets.

The Hydro Circuit with Heater and Ozone

The hydro side is drawn as a chain. The Hydro Massage Push Control and the Air Flow Hydro Massage Intensity Dial Control sit on the deck. Pressing the push control signals a Relay Switch, which starts the Seat Jets Hydro Pump. Water leaves the pump "Out To Hydro Jets," passes through the In-Line Water Heater, and arrives at the hydro jets. The heater is wired through the control box and operates only while the pump is running, maintaining the temperature of the circulating water. The Ozone Generator is drawn with the arrow "Ozone Out to Hydro System," injecting ozone into this loop for sanitation without any bather control. An Air Hose from the intensity dial feeds air into the hydro system, which is how turning the dial changes how firm the jets feel.

The Microbubble Circuit

The microbubble side is completely separate, printed as: Infusion Microbubbles Push Control, to Relay Switch, to Water Pump, Water in, to MicroBubbles Pressure Tank, to Micro Bubbles Out to Jet. The push control on the deck closes its relay, the water pump draws tub water in, the pressure tank (the legend's Pressure Vessel) combines that water with air under pressure, and the water releases through the microbubble jet as a cloud of tiny bubbles that turns the bath cloudy white. This water never passes through the heater or the ozone generator. What the therapy feels like and how to use it is covered in microbubble infusion therapy.

The LED Has Its Own Control Box

A detail that sets this diagram apart is the chromatherapy light. The LED Light is drawn with its own push control and its own LED Control Box, separate from the Electronic Component Controller that runs the pumps and heater. In practice this means a dark light does not point to the pump control box, and a dead pump does not point to the LED box. The LED chromatherapy light is rated 0.5A and runs on its own transformer and control; ozone sterilization is a separate 0.04A. Colors, modes, and light troubleshooting are in the chromatherapy lights guide.

Electrical Printed on the Diagram

Two outlets are printed, #1 and #2, each labeled Wall Outlet, GFCI Protected, Dedicated Line, 20 AMP, 120 Volts. The hydro system with its heater and ozone generator runs from one line and the microbubble system from the other. All components are marked Electrical 110V, and the page carries the disclaimer "Please View Specifications for Electrical Amperage (A), Voltage (V) and Wattage (W)." Use your model's spec sheet for pump, heater, and microbubble pump amperage, and see electrical requirements by model for the overall picture.

Failure Chain to Check

Because the diagram shows each system as a chain, it also gives you the order to check things in.

1. Confirm both GFCI outlets are live and reset. With two dedicated lines, one system can run perfectly while the other is dead because only its breaker or receptacle tripped.
2. Make sure the water covers the jets, the microbubble port, and the intake before pressing either push control so the pumps can prime.
3. For the hydro massage, follow push control, relay switch, seat jets hydro pump, heater, jets. No pump sound points to the control, relay, or the pump's cord.
4. For the microbubbles, follow push control, relay switch, water pump, pressure tank, jet. A pump that runs with clear water points to the pressure tank or the jet, downstream of the pump.
5. For the light, check its own push control and the LED Control Box rather than the pump box.
6. Note your serial number and contact your Ella dealer or the team at (800) 480-6850, or open a request at ellasbubbles.com/support. The detailed microbubble path is in microbubble not producing bubbles.

Download the official document: Hydro Therapeutic Massage + Microbubble Therapy Component Diagram

Related Guides

• Is There a Time Limit on How Long the Microbubble Pump Runs?

Common Questions