SWIMMING IN YOUR OWN POOL
A swimming machine, also known as a counter-current system, creates a flow in your pool. You swim against the flow, remain in one place and can keep swimming continuously, even in a pool that is too small for swimming laps.
Different technologies are used for counter-current swimming, ranging from a jetstream with a narrow jet of water to systems that use a turbine or propeller to move large volumes of water. The technology determines how much water is moved, how wide and how far the flow reaches, where you swim in relation to the machine and how much space the system takes up in your pool.
WHY EVASTREAM SWIMS DIFFERENTLY
A counter-current system needs to move water. But the way it does this determines how the flow feels. Broadly speaking, there are three technologies: jetstream (pump), turbine and propeller.
A jetstream uses a pump to force water through a nozzle at high velocity. This creates high pressure, but also a narrow, hard jet that quickly loses strength.
A turbine uses a thin two-blade propeller inside a straight tunnel. The flow is directed, but without a narrowing outlet it is barely accelerated and therefore loses strength relatively quickly.
A propeller system operates at lower rotational speeds and moves large volumes of water. Without a tunnel, however, very little pressure is built up. The flow is wide, but has limited reach.
EVAstream combines the strengths of these technologies. A specially developed in-house propeller moves a large volume of water and builds pressure. A turbine-shaped tunnel concentrates this force and accelerates the flow through a narrowing at the outlet. The result is a wide, powerful flow that reaches far into the pool. This gives you the space to accelerate and slow down naturally and find your own stroke.
This combination of a propeller and narrowed turbine tunnel is internationally patented.
SYSTEM COMPARISON
The technology behind a counter-current system determines not only how much water is moved, but also how the flow travels through the pool, where you swim, how much noise the system produces and how much space it takes up. Below you can see the key differences.
|
Jetstream |
Turbine |
Propeller system |
Hybride technologie
EVAstream |
|
|---|---|---|---|---|
|
How it works |
Pump forces water through a nozzle |
Thin 2-blade propeller in a straight tunnel |
Large propeller without a tunnel |
In-house developed 3-blade propeller in a narrowed turbine tunnel |
|
Water displacement |
Low |
High |
Very high |
High |
|
Flow |
Narrow and hard, limited reach |
Directed, limited reach |
Wide, limited reach |
Wide and powerful, reaches far into the pool |
|
Flow speed |
High, but only at one narrow point |
Medium (approx. 3.2 m/s at 215 m³/h) |
Lower, distributed over a wide area |
High across a wide flow (5.5 m/s at 225 m³/h) |
|
Rotational speed |
Very high (approx. 2,850 rpm*) |
High (approx. 2,400 rpm*) |
Very low (≤600 rpm*) |
Low (approx. 1,000 rpm) |
|
Swimming position |
Directly in front of the nozzle |
Close to the machine |
Close to the machine |
Further from the machine, spacious swim zone |
|
Noise |
Audible |
Audible (52 dB**) |
Quiet |
Very quiet (29 dB**) |
|
Installation |
Compact |
Compact to medium |
Large, complete system with pool |
Large, complete system with pool |
*The characteristics describe the general operating principle; performance varies by brand and model. The stated rotational speeds and turbine values are reference values from representative systems.
** 29 dB and 52 dB were independently measured in May 2025 by a Swiss acoustic consultancy under identical measurement conditions, both at 215 m³/h.
The further the swim zone is from the machine, the more space you have to swim naturally. EVAstream’s wide, powerful flow reaches further into the pool, giving you room to accelerate and slow down without having to swim close to the machine.
See the swim zone in your poolWHISPER-QUIET SWIMMING MACHINE
At the heart of EVAstream is an in-house developed propeller with three overlapping blades, specifically designed for water. The larger blade surface provides greater grip on the water. This allows the propeller to move large volumes of water and build pressure at a low rotational speed. That low rotational speed not only creates a powerful swimming flow, but also results in an exceptionally low noise level.
This has been independently measured. During a real-world measurement by a Swiss acoustic consultancy in May 2025, 29 dB was measured in the living area adjacent to a private indoor pool with an EVAstream operating at 215 m³ per hour. The background noise level in the same room was 23 dB.
For reference, under the same conditions and at the same water displacement, another counter-current swimming machine measured 52 dB. So while swimming, you hear the water, not the technology behind it.
THREE EXPERIENCES
The EVA System brings counter-current swimming, controls and underwater lighting together in one system. Choose the experience that suits you: from relaxed swimming to focused training.
Swim freely in your own pool, whenever you want. Even in the evening, thanks to optional EVAsubaqua underwater lighting.
| Swimming machine | EVAstream 225 – 550 |
| Underwater lighting | Optional EVAsubaqua |
| Workouts | None |
| Controls | Web app, expandable |
Everyone in the family can experience the pool in their own way: a relaxed swim, playing in a pool full of colour or completing a first swim workout.
| Swimming machine | EVAstream 225 – 550 |
| Underwater lighting | Optional EVAsubaqua |
| Workouts | 4 ready-made |
| Controls | Web app, expandable |
Turn your pool into a complete training facility. Choose from 3 full programs with 20 ready-made workouts or create your own.
| Swimming machine | EVAstream 225 – 550 |
| Underwater lighting | Optional EVAsubaqua |
| Workouts | 20 ready-made + custom |
| Controls | Web app, expandable |
Thanks to EVAstream’s powerful and precisely adjustable flow, you can also use your pool for aqua jogging, water aerobics and therapeutic exercises, for example during rehabilitation or recovery from an injury.
Explore the EVA SystemEVASTREAM MOVE
Place the mobile EVAstream Move on the edge of your pool and start swimming in your own pool within two minutes. It uses the same patented hybrid technology and offers the same functionality as a built-in EVAstream.
As a mobile counter-current swimming system, the Move can be freely repositioned and easily stored away after swimming. The Move was awarded the Red Dot Design Award in 2025.
Explore the EVAstream Move
See for yourself how EVA products could work in your pool. Want to know more? During a short introductory conversation, our advisors can explain which of your wishes can be achieved with EVA products. What is ultimately possible in your pool and which solution you choose is something you decide together with your pool builder.
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