Can I build a DIY Swim Spa? (2025 Update)

It’s one of the most common questions i get asked, can you build a diy swim spa? Well, the short answer is yes, you can build a DIY Swim Spa. In general, Swim Spa, Endless Pool, Counter Currents, Swim Jets tend to all be mixed and matched into sentences used to describe a small pool that has a “machine” to enable you to swim continuously. 

There are a number of different definitions and descriptions but for the purpose of this article, I am going to refer to them as Swim Spa – my definition being a small pool with a machine at the end that will allow you to swim against an artificially generated current.

How do I build a DIY Swim Spa?

I am not going to focus too much in this article about the actual method used to create the pool itself. I have much more in depth articles here on my site and videos on my YouTube Channel that explain the process. What I do want to focus on in this article is the actual “Swim Jet” portion – the technology that created the current to swim against.

Before we get started, let me clarify that I am not going to focus too much on building the pool itself. For that, you can check out the much more in depth articles here on my site and videos on my YouTube Channel that explain the process. 

What I will be focusing on in this article is the actual “Swim Jet” portion – the technology that creates the current that you swim against. How it works, the options in the market, and what the right choice is for you.

What is not a swim jet?

Before I move onto the definition of what a swim jet actually is, I am going to start with what it is not. Firstly, it is not the same thing as a strong swimming pool return. Next, it is not a strong hot tub jet or indeed a cluster of hot tub jets.

The technology and research that has gone into swim jets has created some pretty cool products. Some pretty cool products that can be used from enthusiast swimmers to Olympians alike so it has to be realistic in terms of the experience. 

That is also why we are not talking a couple of hundred bucks for a few hot tub jets here! If you’ve been following me then you know that I dont take the simple way and compromise. Its either the real deal or no deal.

So, now that we’re clear that swim jets aren’t just hot tub jets, let’s take a closer look at what they are and how they work. 

What is a Swim Jet?

A swim jet is a system designed to create a counter-current in a pool, allowing swimmers to swim continuously in place. There are two primary types of swim jets, each with distinct mechanisms:

1. Electronic Swim Jets
   This type relies on an electric pump, an impeller, specially designed jets, and a suction system, typically housed in a dedicated unit on the side of the pool. The pump generates the powerful water flow required for the counter-current, enabling swimmers to enjoy an endless swimming experience.

2. Hydraulic Swim Jets
   Unlike electronic systems, hydraulic swim jets use hydraulic pressure to generate the counter-current. With no electrical components poolside, this option is often considered safer. Hydraulic pressure is transmitted through lines to create the desired water flow.

Both types of swim jets are effective solutions, with the choice depending on preferences for safety, installation, and maintenance.

 

How do I choose a swim jet system for my DIY Swim Spa?

Choosing the right swim jet system for your DIY swim spa depends on a few key factors. Here’s what you need to consider:

1. Power of the Jet

Think about how fast you want to swim and how much resistance you need. Are you more of a “Homer Simpson” or a “Michael Phelps”?

• If you’re a casual swimmer looking for light exercise, a less powerful system will suffice.
• Pro swimmers, or those aiming for intense workouts, will need a more powerful unit with higher flow rates.

Water flow is measured in Gallons Per Minute (GPM), and for an effective swim experience, you’ll want a system that delivers at least 600 GPM. Anything less might not provide enough resistance for a quality workout. Remember, more power usually means a higher cost, so avoid over-investing in a “Michael Phelps” system if you don’t need that level of performance.

2. Noise Levels

Nothing ruins a swim like a loud, disruptive machine. Swim jet systems vary in noise levels, so take the time to research and compare. Look for systems with a low decibel (dB) rating, and if possible, test them or consult the manufacturer.

Hydraulic systems tend to be quieter than their electrical counterparts, making them a great option if noise is a concern.

3. Bubbles in the Stream

One major difference between a proper swim jet and a hot tub jet is the presence of bubbles. Bubbles indicate air being mixed into the stream, which results in less effective resistance and a less efficient workout.

• Systems that add bubbles consume more energy and can make visibility difficult while swimming.
• Choose a bubble-free system that pushes only water for maximum efficiency and better performance.

Check with the manufacturer to ensure the system is designed to produce a clear, bubble-free current.

By considering these factors—power, noise levels, and bubble-free operation—you’ll be able to choose a swim jet system that matches your fitness goals, budget, and swim spa experience.

 Built-in or Retro-Fit?

Deciding on whether you should get a swim jet built in or retro fit one is a relatively straightforward decision. If you are building a new pool, then you are going to want to design this from the outset. This means you are going to have to select the model you need, get the dimensions etc so that it can be built into the pool wall. 

The units tend to be self contained so it is really like incorporating a “square box” into your walls – it’s a very straight forward process to be honest.

The retro-fit units do tend to be cheaper and are good if you have a pool already and want the functionality of a swim spa. However, I would not recommend these if you are building a new pool. Not only will it be an off the shelf solution which, no matter what you do, won’t give you the aesthetic of a built-in one.

How Much do Swim Jets Cost for a DIY Swim Spa?

I hate generalized questions like these. I know curiosity gets all of us but this is like comparing a toyota to a ferrari kind of analogy. It all really depends on the kind of setup you have and what kind of swim jet you’re going for. However, to satisfy your curiosity, a general idea is that they start around the $3000 mark and from there can go up to 10x that price. This would be for the all singing all dancing “Michael Phelps” standard model.

In terms of adding one of these to your cocktail or plunge pool is probably going to add 50% to your overall build cost at the least. Substantially more if you are a good standard swimmer that needs a model with higher specifications.

What about a more cost effective Swim Jet for DIYers?

For those looking for a cost-effective and practical alternative to expensive swim jet systems, I’ve designed a swim jet that’s perfect for DIYers. It’s simple to install, powerful, and ideal for anyone building their own Swim Spa.

Key Features of My DIY Swim Jet

1. Compact and Efficient Design

   The swim jet fits neatly into the wall of your Swim Spa during the construction phase. Unlike other systems, the pump should ideally be positioned directly behind the jet for maximum flow efficiency. If the pump is placed 10 to 20 feet away, you risk losing a significant amount of flow.

2. Maximum Flow for Optimal Performance

   This swim jet is designed to deliver the highest possible flow rates, ensuring a fantastic swimming experience. It’s a reliable and affordable solution compared to many of the high-cost swim jets currently on the market.

3. Easy Installation

   The swim jet housing is concreted into the walls during the build process. Once the final surface of the Swim Spa is complete, the faceplate is installed for a clean, finished look.

4. Flexible Pump Options

   The swim jet is available with or without a pump, giving you the flexibility to choose your own. If you’re using your own pump, make sure it’s at least a 3HP pump—and ideally larger—if you’re using a standard swimming pool pump, as these tend to have lower flow rates.

 

 

This DIY swim jet is a great way to combine functionality, performance, and cost-efficiency for your Swim Spa project. Whether you’re a casual swimmer or training for serious laps, this system delivers a strong and reliable counter-current at a fraction of the cost.

In Conclusion

You can certainly build a DIY swim Spa that creates a counter current for you to swim against. You need to do some research into the models available on the market and pick one that matches your own swim level.

Adding a swim jet to your pool does increase the value and desirability of it – any good realtor will be able to confirm this.

Lastly, they are not cheap. I would even go as far as to say that they are expensive. This is because they are not “just big jets” and a lot of research and design has gone into creating a real swimming experience.

Hope you found this article useful

Happy Swim Spa’ing

 

Can I Help You?

If I can help you in any way I would love to hear from you. You can get in touch using the form below.

Thanks - Andi

 

Hi, Andi here. I own Buildahottub.com and also write all of the articles and info pages on the site. Some years back now, I built my own hot tub but struggled to find the information I needed. So, once my tub was complete, I started this website to help others in their own pursuit of hot tub and plunge pools DIY building information.

Today, I've helped over 1000 DIY customers just like you all over the world build hot tubs and pools. Have a good look around the site, there are lots of resources here. Please do get in touch if I can help you. - Cheers, Andi