Microbubble System Not Working: Buzzing, No Cloudiness, Big Bubbles, and the Pressure Tank

When the microbubble system is not working on your Ella's Bubbles tub, the fastest way to sort it out is to follow the path the system itself uses: the Micro push control sends an air signal to a relay switch in the control box, the relay powers a 1 HP water pump, the pump pushes water through the microbubble pressure tank, and the supersaturated water returns through a single port in the tub, turning the water from clear to cloudy. If the button does nothing, the pump buzzes without any cloudiness, or you see large bubbles instead of a milky cloud, one link in that chain needs attention. Here is what you can check yourself and when to hand the job to the technical team.

The video shows normal operation: one touch of the Micro button starts the system, billions of microbubbles are generated from a single port, the water turns from clear to cloudy, and a second touch turns the system off. That clear-to-cloudy change is the test to use: if the water clouds, the system is working. Our Infusion microbubble therapy article explains what the therapy does and which tubs offer it. Watch: MicroBubble Therapy Infusion: Top Voted Walk-In Tub 2020 with a full transcript.

How the System Is Built

• Control: a pneumatic push button (an air switch) labeled Micro. Some Transfer and legacy models ship with unlabeled push controls.
• Relay switch: inside the control box; the air signal pushes the relay, and the relay powers the pump.
• Pump and pressure vessel: a 1 HP, 7.3A pump with a pressure tank and agitator valve (10A on the Standard60 H2 system).
• Delivery: one jet. LayDown tubs run the optional single-jet system on one dedicated 20A, 120V GFCI line; the Hydro + Microbubble package on stainless steel and outward-swing tubs runs on two dedicated 20A, 120V lines.

Checks You Can Do in a Few Minutes

1. Confirm the tub actually has the microbubble package. Microbubble therapy is optional on most models, and the owner's manual describes every package, so a Micro button in the manual does not mean your tub was built with one. Look behind the access panel for the microbubble pressure tank. No tank means the system was not ordered; your serial number lets the team confirm.
2. Fill above the port before you press anything. Never run any pump before water covers all jets and ports; running a pump dry causes permanent damage that is not covered. Fill levels for every therapy are in how much water before turning on the jets.
3. Check power. Confirm the breaker and the GFCI outlet for the microbubble line are on and reset. A green LED on the control box shows power is reaching it. On a two-line package, the microbubble pump is on its own dedicated line, so check that outlet specifically.
4. Check the air tube. The tube from the Micro button must be pushed firmly onto its fitting on the control box with a twist-and-push motion, and the hose and lock nut behind the button itself must be secure. Our pump not working article walks through both connections step by step.
5. Reset the control box. If several functions misbehave at once, or the system stopped after a power event, follow our control box reset guide.
6. Standard60 H2 system only: weak output usually means the blue tank needs fresh distilled water. Tap water is not suitable for that tank. See our H2 microbubble article.

Buzzing with No Cloudiness, or Large Bubbles

Microbubbles are smaller than 50 microns, so a working system makes the whole bath look milky rather than producing visible bubbles. Two symptoms mean the pump has power but the system is not doing its job:

• The pump hums or buzzes but the water never clouds. Turn the system off and do not keep cycling it. First confirm the water level, then check for an air lock at the pump connection and that the pressure tank fittings are tight. If it still only buzzes, this is a pump or pressure-tank issue the technical team needs to diagnose with your serial number. A pump that has been tripping the breaker and now rattles belongs in the same category and should stay off.
• Large bubbles after a few seconds instead of a fine cloud. First confirm the port is fully submerged and that you are running the microbubble system on its own. You can run hydro jets and microbubbles together, but for the full effect we recommend using microbubble therapy by itself. Large bubbles rather than a fine cloud usually mean the tank is not holding pressure or the agitator valve needs attention, so if the water still does not turn cloudy, open a ticket with a short video of what you see.

Epsom Salts and Bath Products

Please do not run the microbubble system (or the hydro jets) while Epsom salts are in the water. Enjoy salts as a soak after your therapy session, fully dissolved, then drain the tub promptly and wipe the chrome finishes, since salts can spot or discolor chrome. Bath bombs and oily products are not recommended in any jetted tub because they can affect the mechanics and clog the system; the full guidance is in Epsom salts, bath bombs and oils. Debris or specks that appear when the microbubbles run usually clear with the same monthly vinegar flush used for the jets.

Pressure Tank and Other Replacement Parts

Replacement parts for the microbubble system, including the pressure tank, are available through the parts team. If a pressure tank has split or is leaking, turn the system off at the breaker and open a ticket with your serial number, photos of the tank, and a description of what happened. The parts team identifies the correct tank for your tub from the serial number and arranges the replacement. The microbubble system is supporting equipment under the Lifetime Limited Warranty, so covered parts go through the normal warranty verification with photos of the defect and a description of the problem, as described in how to start a warranty claim.

"All Sales Are Final for Microbubble Units"

Invoices for tubs ordered with microbubble therapy carry the line "ALL SALES ARE FINAL FOR MICROBUBBLE UNITS." That means a microbubble tub cannot be returned or exchanged once purchased. It does not change your warranty: the microbubble equipment is covered as supporting equipment under the same terms as the rest of the tub.

Related Guides

• Fixing a Leak at the Microbubble Tank Fitting With the Repair Kit
• Microbubble Nozzle Sprays From the Side or the Trim Ring Fell Off: Getting a Replacement
• Is There a Time Limit on How Long the Microbubble Pump Runs?

Common Questions

Watch: The Deep Cleaning Power of Microbubbles: A Practical Test on its own page.

This short clip shows a working microbubble bath and is a good reference for what a healthy, cloudy fill looks like.

For anything specific to your model or serial number, open a ticket at ellasbubbles.com/support or call (800) 480-6850. The team is glad to help.