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What Are Hydro Massage Jets on a Walk-In Tub?

Updated September 2026

Hydro massage jets, also called hydrotherapy jets, water jets or whirlpool jets, are the water jets in an Ella walk-in tub that are fed by a pump recirculating your bath water. They deliver a deep, targeted massage to the back, hips, legs and feet, with the strength set by the intensity dial on the deck. The gentler air massage system is covered in hydro massage vs air massage.

How It Works

When you press the Water button, the hydro pump draws bath water in through the inlet cover and pushes it out through the jets. The in-line heater and the ozone generator both run automatically with the hydro pump: the heater holds the water at the temperature you filled it, and the ozone sterilizes the water as it circulates. The intensity dial is an air control on a small hose rather than an electrical part; turning it adds or removes air in the water stream to make the massage firmer or softer. Many hydro jets can be aimed, and the foot jet nozzles opened, reduced or closed by turning the center, as shown in our jet adjustment article.

Walk-in tub adjustable hydro jet assembly with white jet body, chrome face cap, spring and rubber gasket
An adjustable hydro jet assembly: jet body, chrome face cap, spring and gasket.

Which Ella Models Have It

Hydro massage runs across the Ella line, from the hydro-only Standard, Zen and Flow to the two-seat tubs. Jet counts belong to the package, not the model name. The Standard ships with 18 hydro jets on an 8.1A 900W pump (model profile). The Elite's hydro package has 16 jets, 10 in the seat and 6 in the foot area (model profile). On the Transfer family, the Hydro Massage package lists 22 jets, 16 seat and 6 foot (model profile). Tubs with independent foot massage add a second pump and dial for the foot and calf jets. The full table is in jet counts by model and package.

What to Know as an Owner

Fill the tub 1 to 2 inches above the highest hydro jet before starting the pump; running a pump dry causes permanent damage that is not covered by warranty. Our water level guide shows the mark for each system. Once a month, and any time the jets feel weak or debris appears, run the vinegar flush: 2 cups white vinegar with 2 cups water, fill 1 inch above the highest jets, run for 10 minutes and drain. Clean the pump inlet cover at the same time, and skip bath bombs, which clog the jets.

If the pump will not start, the pump troubleshooting article lists the first checks. For a ticket at ellasbubbles.com/support, have your therapy package name, which jets are affected, the intensity dial position, the water level you used and your model and serial number.

Video
Chapters in this video
  1. 0:00 Ella's Bubbles Walk-In Tubs The video showcases various Ella's Bubbles walk-in tub models and their innovative features.
  2. 0:15 Hydro Jetting Features The video highlights the hydro massage and air massage systems available in Ella's Bubbles walk-in tubs.
  3. 0:49 Relaxing Home Spa Experience The video demonstrates how Ella's Bubbles walk-in tubs provide a luxurious and relaxing home spa experience.

Watch: Walk-In Tubs Featuring Innovative Hydro Jetting for a Home Spa Experience on its own page.

Common Questions

What is the difference between hydro massage and air massage?
Hydro massage recirculates bath water through a pump for a deep, targeted stream you can aim and adjust with the intensity dial. Air massage uses a three-speed blower and small brass jets for a gentle, effervescent full-body bubble massage.
How many hydro jets does an Ella tub have?
The number of hydro jets on an Ella walk-in tub depends on the specific therapy package, not just the model name. For example, the Ella Standard model comes with 18 hydro jets, the Elite's hydro package has 16 jets (10 in the seat and 6 in the foot area), and the Transfer family's Hydro Massage package lists 22 jets (16 seat and 6 foot). You can find the full table of jet counts by model and package in the jet counts by model and package article.
Why do my hydro jets feel weak?
Check the intensity dial and the foot jet nozzles, which may be turned down or closed. Then run the vinegar flush and clean the pump inlet cover. If that does not help, open a ticket with your package and symptoms.
How much water do I need before turning on the hydro jets?
Before turning on the hydro jets, you need to fill your Ella walk-in tub 1 to 2 inches above the highest hydro jet. Running the hydro pump dry, meaning without sufficient water covering the jets, will cause permanent damage to the pump. This type of damage is not covered by the product warranty. The water level guide shows the specific fill mark for each system.
Does the in-line heater run with the hydro jets?
Yes, the in-line heater runs automatically with the hydro jets. When you press the Water button to activate the hydro pump, both the in-line heater and the ozone generator start automatically. The in-line heater is designed to maintain the temperature of the bath water you filled the tub with; it does not heat cold water, so always fill the tub with hot water from your faucet. The ozone generator also runs automatically with the hydro pump to sterilize the water as it circulates.

About this guide. Answers in the Ella’s Bubbles Support Center are compiled from real conversations with tub owners, our technicians’ notes and the product documentation, then reviewed by our team. Tub models and options have evolved over the years, so a detail here may differ slightly from your exact tub. If something looks different on yours, send us your serial number and a specialist will confirm it for your model.

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