How often does the microbubble pressure tank need draining or service?

The microbubble pressure tank is a sealed pressure vessel inside the pump loop, not a reservoir, so there is no draining schedule and no service interval for the owner to keep. It is not a user serviceable part, and the only routine upkeep on the microbubble side is the same monthly vinegar flush you already run for the jets. If the system stops clouding the water, start with Why Isn't My Microbubble System Making Bubbles? rather than trying to open the tank.

What the Pressure Tank Does, and Why There Is Nothing to Drain

Every Ella microbubble package follows the same chain. Pressing the Micro push control sends a puff of air down a hose to an air switch, the switch operates a relay in the control box, the relay starts the microbubble water pump, the pump draws bath water in and pushes it into the pressure tank, and the supersaturated water returns to the bath through a single dedicated port. The LayDown microbubble schematic draws that sequence component by component, and the Hydro + Microbubble schematic for stainless and outward door tubs shows the same pump and pressure vessel sitting alongside a hydro pump on its own line.

The tank sits between the pump and the jet, behind the access panel on the backrest side of the tub. It is where water and air are combined under pressure before the bubbles release at the jet, which is what turns the bath from clear to milky white. Because the pump draws its water from the bath itself, the tank is only working while the pump runs and the tub is filled above the jets. It is not a holding tank that slowly fills with stale water, and it has no drain plug, filter or cartridge for you to pull. The video on this page shows what a healthy system looks like: one touch of the Micro button, billions of microbubbles from a single port, the water turning from clear to cloudy, then one more touch to turn it off.

The One Routine That Keeps the Microbubble Side Clean

Upkeep for the microbubble system is the vinegar flush, run before the first bath in a new tub and then once a month. The flush clears any debris or specks you notice while the microbubbles run, and it reaches the pump, the tank and the port because the system circulates bath water.

1. Combine 2 cups of white vinegar with 2 cups of water.
2. Fill the tub with water to one inch above the highest jets, so the microbubble port is covered too.
3. Add the vinegar mixture to the bath.
4. Run the tub for 10 minutes.
5. Drain.

Flushing after every bath is not necessary. Between flushes, what goes into the water matters more than any schedule. Do not run the microbubble system with Epsom salts in the water, and avoid bath bombs and oily products, since they can affect the mechanics and clog the system.

The Automatic Purge Belongs to the Air System, Not the Tank

Owners sometimes hear a pump start on its own after a bath and assume the microbubble tank is draining itself. That sound is the air massage Auto Purge, which activates automatically 20 minutes after the air pump is turned off and runs for 120 seconds to blow residual water out of the air lines. It is fully automatic, cannot be stopped, and is normal even if it starts while you are still in the room. It exists only on tubs with an air massage package, and it has nothing to do with the microbubble pressure tank. The microbubble side has no purge cycle because its loop carries bath water rather than air, and that water leaves with the tub when you drain.

When the Tank or Pump Does Need Attention

Because there is no owner service, the signs to watch are performance signs. Run through them in order before assuming the tank itself is at fault.

• Confirm your tub has the package. Microbubble therapy is optional on most models. Look behind the access panel on the backrest side for the pressure tank. No tank means the system was not part of your order.
• Fill first, always. Water must cover the microbubble port and every jet before you press anything. Running a pump dry causes permanent damage that is not covered, so a dry test is never a valid test.
• Check power. On a combined package such as Hydro + Microbubble, the microbubble pump runs on its own dedicated GFCI protected 20 amp line, separate from the hydro pump. The Front Entry Hydro + Microbubble schematic prints both outlets. Reset the breaker and GFCI for that line and look for the green LED on the control box.
• Reseat the air tube. Push the tube from the Micro button firmly onto its control box fitting with a twist-and-push motion, then press the button and listen for the relay click.
• Pump runs, no cloud. Switch it off, confirm the water level, then check for an air lock at the pump connection and that the pressure tank fittings are tight.
• Big bubbles instead of milk. Large bubbles appearing after a few seconds point to the pressure tank or the agitator valve rather than to power or the button.

If the pump runs but no bubbles appear, or the bath makes large bubbles instead of turning milky white, open a ticket at ellasbubbles.com/support with your serial number and a short video of the system running. If a tank has split or is leaking, switch the system off at the breaker and send your serial number and photos so the correct tank can be identified. The pressure tank is supporting equipment under the Lifetime Limited Warranty, which covers parts only, so the replacement tank ships to you and a local licensed plumber or electrician makes the swap. Ella does not send technicians.

What This Means for Your Maintenance Calendar

Put one entry on it: the vinegar flush, once a month, with the first one before your first bath. Keep salts, bath bombs and oils out of the water, and glance behind the access panel now and then for any sign of moisture around the tank. Everything else about the tank is either automatic or handled under the warranty. If you would like a maintenance schedule written for your exact tub and package, the team at (800) 480-6850 can confirm it from your serial number.

Watch: MicroBubble Therapy Infusion: Top Voted Walk-In Tub 2020 | Ella's Bubbles with chapters and a full transcript.

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• Microbubble System Not Working: Buzzing, No Cloudiness, Big Bubbles, and the Pressure Tank
• How Do I Clean and Maintain My Walk-In Tub?
• What Comes With Each Therapy Package: Pumps, In-Line Heater, Ozone, Auto Purge, LED, Dials, Pressure Tank and Controls at a Glance

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