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HydroWorx 3500

World Class technology

Largest Customizable Aquatic Therapy Pool

The HydroWorx® 3500 Series offers innovation and maximum versatility to your facility. Its large interior space allows greater functionality for multiple patient therapy stations or group classes. The varying depths of the pool floor also allow for natural patient progression.  This 12’x16′ therapy pool comes standard with HydroWorx’s patented underwater treadmill technology and resistance jets in one station. An additional underwater treadmill can be added to the pool footprint. Up to three 4-foot extensions can be added to the length of the pool to increase the size to 12’x28′.

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Variable Speed Underwater Treadmill (up to two):
  • The integrated underwater treadmill surface has a cushioned low-impact design with excellent traction
  • Treadmill speeds smoothly increase from 0 to 7.5 mph in safe .2 mph increments
  • Useful for gait training, sports specific activities, and aquatic therapy
Resistance Therapy Jet with Massage Hose (up to five stations):
  • Resistance jets are essential for orthopedic therapy, rehabilitation, sports performance training, and swimming or deep tissue massage
  • The jets have a wide range of water speeds and directional configurations
7' Deep Water Access Area (Optional Upgrade):
  • Designed to give patients extra depth for unloading
  • Allows up to 7′ of water depth
  • Ergonomic stairs with handrail for safe access
Touch Screen Interface and Remote:
  • Better control and functionality with easy-to-use touch screen interface and remote capabilities on a tablet.
  • Easily monitor progress and set goals from anywhere in the pool room with large TV screen readout showing speed, water depth, time and distance.
  • Maintain the same control from anywhere in the room or pool via tablet.
Underwater Cameras & Monitoring System:
  • The 3500 Series resistance pool’s cameras and viewing monitor enhance your diagnostic capacity
  • One side view and one front view with a flat screen monitor for viewing
Multiple Water Depth:
  • Varying water depths allow clinicians to treat multiple patients at different stages of weight bearing status
Variable Water Depth Reservoir Tank (optional upgrade on 12'x16' model):
  • Offers the ability to quickly add or remove up to 8″ of water to attain pool depths ranging from 3’6″ to 7′, with the touch of a button
  • HydroWorx products are made with superior strength and durability
  • First-year parts and labor warranty
  • Five-year structural warranty
  • Extended warranty and service plans are available
Start-Up and In-Service Training:
  • Comprehensive product training
Technology Upgrades Available

For full technical information, click the button below

Design and Install Guide
3500 Therapy
Product Video

Expand to view frequently asked questions about the product

What are the unique performance features of the HydroWorx 3500 Series pool?

Multiple Variable Speed Underwater Treadmills

The variable speed underwater treadmill, which smoothly increases from 0 to 7.5 mph in safe .2 mph increments, has a cushioned low-impact design with excellent traction. Add an additional variable speed treadmill to the floor footprint. This additional underwater treadmill can be positioned at the same depth or 6″ deeper than the standard treadmill. This option also comes with resistance jets.

Resistance Jet with Massage Hose (up to 5 stations)

A resistance jet is essential for competitive sports performance training, therapy protocols, swimming or deep tissue massage. The jet has nearly 200 different water speeds to choose from. Add up to 5 additional Resistance Jet stations to maximize the pool’s footprint.

Resistance Jet with Massage Hose

A resistance jet is essential for competitive sports performance training, therapy protocols, swimming or deep tissue massage. The jet has nearly 200 different water speeds to choose from.

Underwater Cameras & Viewing Monitor

Customize the 3500 Series to include two underwater camera and a flat screen viewing monitor to greatly enhance a clinician’s diagnostic capabilities when evaluating a subject’s underwater gait pattern.

7′ Deep Water Access Area

Designed to give athletes and patients extra depth for un-loading, this 7′ deep well area is a great way to accommodate deep water running or taller patients and athletes.

Removable Stainless Steel Support Bars

Lightweight multi-functional and positional bars ensure patient comfort and security.

Variable Water Temperature

A fully automated, state-of-the-art-heating unit provides variable water temperature. Electric or gas systems are available.

Technology Package

This optional feature includes a fully integrated computer system with custom designed documentation software. The software monitors the pool functions, treadmill speed and jet speed and then uses this information to display and store information in a patient database for future reference and progress reports. Package also includes handheld wireless remote that controls all pool functions.

Who are a few of your 3500 Series customers?


  • Dr. James Andrews
  • Pinnacle Health Systems
  • Beverly Healthcare
  • St. Paul Children’s Hospital
  • Olympic Memorial Hospital
  • Summit Place Independent Health Center
  • Heather Hill Hospital
  • Harrison Memorial Hospital
  • Mid-America Rehabilitation Campus and Glens Falls Hospital


  • New York Giants
  • Ohio State
  • Philadelphia Phillies
  • Eagles & Flyers
  • Indiana Pacers
  • Dallas Mavericks
  • San Antonio Spurs
  • Cincinnati Bengals
  • University of Arizona
  • Texas A&M University
  • North Carolina State
  • Gold’s Gym

What is an example of how the college & pro sports teams utilize the HydroWorx 3500 Series pool?

Multiple-athlete cardiovascular interval training is accomplished with directional resistance jets and the underwater treadmill. Athletes are placed in alignment with two resistance streams that hit the mid-point of the athlete’s chest. The floor can be positioned at various depths to create different loading effects.

Sample Session: Begin the interval with the treadmill speed at 6 mph but without jet resistance. After a warm-up of 5 minutes, increase the treadmill speed to 7.5 mph or higher and activate the jets at a resistance level of the trainers choosing. This will provide a resistance that simulates an intense up-hill run and elevate the athlete’s heart rate. Stop the jet for approximately 20-30 seconds and begin again.

Our clientSuccesses

Read More Success Stories

Not only is this pool an impressive visual in our clinic, it allows us to reach all of our patients more effectively — from athletes to geriatrics and pediatrics. I became a therapist to help people move. And there is no better way to do this than in a HydroWorx pool.

The Orthopedic and Sports Medicine Institute Weldon Russo, Director

We’ve had remarkable success stories from various individuals including Major League Soccer players returning to play months earlier than expected and crediting that in large part to their use of the HydroWorx 2000 underwater treadmill.

Fortius Sport & Health Caleb Cousens, Online Marketing Coordinator

Investing in high-quality equipment and the associated implementation costs may seem daunting, but when these state-of-the-art tools help build our business, brand us as the facility of choice in our communities and increase the scope of our operations, they are investments worthy of a deep dive.

Clear Choice Health Care Geoff Fraser, Senior Vice President of Operations

"HydroWorx allows us to return players to training in a much better physical condition than if we did not have it. For example, the integrated underwater treadmill and resistance jets allows us to work specific running drills performed on the field much earlier for our typical injuries such as ankle ligament sprains, knee ligament sprains and fractures.”

Manchester United FC Neil Hough, Head Physiotherapist

Our statistics thus far show 28% increase in center of gravity, 37% in lower body strength, and 19% of clients moved out of fall risk category. We will continue to use FallProof H2O and the HydroWorx 1200 Series, as we are getting great results and the best part of all, our participants love it too!

Lakeview Village Jackie Halbin, Living Well Manager

When considering return to sport, the difference between a normal swimming pool and a HydroWorx is half [when compared to land rehabilitation]. It is a 20 – 25% improvement from getting a player back from a typical ankle, knee or muscle injury.

West Bromwich Albion FC Dr. Mark Gillett, Head of Performance

Our HydroWorx pool gives our patients a great way to exercise without pain. By using aquatic therapy with an underwater treadmill, they can oftentimes return faster to the sports and activities they love doing earlier than they would be able to with land-based therapy alone.

OrthoCarolina Cheryl Bennett, Aquatic Therapist

"The HydroWorx pools are the highlight of our new Sports Medicine Center! We are now able to get people healthier and back to play quicker and stronger than ever before!"

Butler University Ryan Galloy, Director of Sports Medicine

The HydroWorx pools allows us to provide the best care possible for our athletes by giving us a tool to unload body weight while still allowing them to get work done whether it be a cardio or a rehab session. The pools play a big role in their recovery from sore muscles to major surgeries.

University of Utah Katherine Lorens, Assistant Athletic Trainer

Overall, we have far exceeded our volume and revenue projections. Many local physicians want aquatic therapy as part of the treatment plan for their patients. The physicians have a lot of trust in us. Every single day we have patients in the pool — sometimes it’s been booked to capacity. We do more volume than any other therapy provider in a two-county region.

Cox Monett Clinic Kevin Norris Rehab Manager

Besides a clinician’s manual skills a HydroWorx pool is the best tool you can have in your facility, period!! Its versatility is unmatched with the ability to effectively and efficiently treat any type of orthopedic condition.

Georgia PT & Sports Medicine Chad Luth, Owner

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“Our new HydroWorx pool has become an invaluable tool for Performance PT.  It has allowed us to improve the diversity of care for all of our patients.  The pool is an amazing tool for us to be able to use with all levels of patients.  We have patients recovering from hip surgery to training professional athletes on our underwater treadmill.  Patients are excited to be able to perform activities in the near weightless environment that would not be practical in a land based clinical setting.  We are seeing patients progressing faster and having improved outcomes in less appointments.” – Dr. Brian Hay, DPT, MS, OCS