ContrastSpa Duo

Your optimum contrast bathing setup.

The CET Contrast Spa Duo consists of a cold CryoSpa Sport ice bath combined with a hot ThermoSpa Sport and sharing central steps.

Today, most strength and conditioning coaches have a preference for either contrast therapy i.e. alternating hot and cold or for cold water immersion alone.

Many high profile clubs including Premier League clubs such as AFC Bournemouth and Crystal Palace FC utilise contrast bathing as part of their recovery strategy and have opted for the ContrastSpa Duo option.

The Australian Institute of Sport are also strong supporters of contrast bathing. The most common ritual is 1 to 3 minutes hot followed by 1 to 2 minutes cold with the process repeated 3 or 4 times. And most users will advocate finishing with the cold in order to close the pores before dressing.

Contrast bathing works by promoting rapid alternation between vasodilation and vasoconstriction, which causes a ‘pumping’ action in the peripheral circulation by using temperature rather than manual methods. Heat stimulates circulation bringing in fresh blood, lymph, oxygen, water and nutrients while cold contains the inflammatory response and expels stagnant fluid and waste products.

Benefits for Athletes

  • Provides short effective recovery post-exercise.
  • Reduces muscle swelling and muscle spasms.
  • Soothes repetitive strain injuries.
  • Reduces soft tissue swelling and joint stiffness.
  • Reduces fatigue – lowers the risk of injury.
  • Effective in aiding pain relief.
  • Promotes better circulation.

Benefits for Staff

  • Easy to maintain saving on labour and cost.
  • Effective filtration in each spa keeps the water clear.
  • Digitally controlled chiller maintains the required water temperature.
  • Quiet operation.
  • Short treatment times due to alternating intense cold / heat.

Features include

  • Temperature range 1C to 14C [34F to 55F] for the CryoSpa.
  • Temperature range up to 40C [104F] for the ThermoSpa.
  • Hydrostatic pressure and 20 Massage Jets per Spa.
  • Penetrating cold / heat for effective therapy and short treatment times.
  • High salt concentration in the CryoSpa aids infection control.
  • 100 sq ft filtration per spa keeps the water clear.
  • CryoSpa with high quality low temperature digitally controlled chiller.
  • Digitally controlled heater with display on the ThermoSpa.
  • Stainless steel safety rail and steps.
  • Two year guarantee on spa body.

You can vary the therapy according to your requirements

  • Simply chill / warm up in the water without the massage jets on for a less intense ice / hot bath experience.
  • Turn the 20 massage jets on for penetrating cold / heat and the optimum post-exercise recovery.
  • Adjust the air nozzles to minimize or maximize the massage effect.
  • Opening the air nozzles fully maximizes the power of the massage giving an optimum therapeutic effect ideal for post-exercise recovery.

Four Treatment Modalities

  • Sit on top for ankle therapy
  • Stand on step for submersion to mid-thigh
  • Stand in deep end for submersion to waist depth
  • Sit on step for full body submersion


  • 230v / 1 / 50hz
  • 230v / 1 / 60hz
  • 115v / 1 / 60hz

Dimensions of each Spa

  • c. 1.55m x 0.80m x 1.20m [L x W x H]
    c. 61″ x 32″ x 48″
  • Steps: c. 0.55m wide (c. 22″)

Weight of each Spa

  • Empty: c. 200 kg / 441 lbs
  • Full: c. 750 kg / 1650 lbs


  • 20 Massage Jets per Spa
  • 1.5kw Jet Pump per Spa

Steps & Rails

  • Stainless Steel Steps and Safety Rails


  • Low noise low temperature chiller


  • Stainless steel brackets for wall mounting the chiller.


ContrastSpa Duo product images

Frequently Asked Questions

Question not answered?

Why do footballers take ice baths?

It is quite commonly stated that ice baths reduce lactic acid but this is not the case. Lactic acid, or lactate, occurs when the body gets into an oxygen debt situation i.e. is functioning anaerobically. When the level of activity ceases, or reduces sufficiently, in simple terms the body can acquire surplus oxygen, which is used to convert the lactic acid back to its normal pyruvate / pyruvic acid state.

According to Gregory Dupont, who presented at the FIFA sponsored Sports Injury Summit held at Wembley in 2013 the main precursor of injury is fatigue. Further research investigated the common strategies for aiding recovery, minimising fatigue and, thereby, lowering the risk of injury.

The conclusion was good diet, good sleep, hydration [all lifestyle factors] plus cold water immersion were the main scientifically proven methods of aiding recovery and minimising fatigue.

The other side of the coin is performance and here we find that fatigue inhibits performance. So if we can manage fatigue by improving fitness and aiding recovery the outcome is improved performance and lowered risk of injury.

Should I use an ice bath after every training session?

The debate on the use of ice baths, or cold-water immersion, rages on with many pundits claiming it is good and others claiming it is not.

The answer depends on the stage of training the athlete is at and the main objective of that training block.

If you are in the pre-competition phase of training and the main objective is to build power then there is research indicating that ice baths (and other micro-strategies for minimising training responses, such as anti-oxidant supplementation) during this phase may limit the adaptation effect i.e. your muscles will adapt to the increased workload faster if the body is allowed to contend with the inflammation and micro-tears naturally without the intervention of cold water immersion.

However, if you are tapering the workload toward an upcoming competitive event or if you are in the competitive part of the season then the main focus shifts to recovery and minimising fatigue rather than power building and in these circumstances research indicates the use of ice baths will be beneficial.

The key word here is fatigue. Fatigue is the main precursor of injury and is also a major performance inhibitor. Consequently, the fitness coach’s objective is to maximise fitness and minimise fatigue in order to maximise performance and lower the risk of injury.

And the main strategies for combating fatigue: Good Sleep, Good Diet, Hydration and Cold Water Immersion [per Gregory Dupont, FIFA Sports Injury Summit, Wembley Stadium, April 2013].

The argument is further complicated in team sports where skill, tactics and pre-planned moves need to be coached on the training pitch. In these sports the coach will want the players to be mentally alert and physically prepared to benefit fully from the coaching session, not hobbling around only partially recovered from the previous day’s training. In this instance, there may be a conflict of interest where the fitness coach is trying to maximise adaptation while the team coach wants the players recovered sufficiently to benefit fully from the training session, therefore, CWI may be strategically used to fit the on-going training session plans rather than eliminated to cater for both objectives.

So are ice baths good or bad?

The answer depends on the part of the season and the main objective of the current training regime. In the competitive phase of the season the use of ice baths will help minimise fatigue and aid recovery, thereby improving performance and lowering the risk of injury. In the pre-season, or power-building phase, of training the use of ice baths may adversely affect the adaptive response.

So, as with most tools in the athlete preparation toolbox, it is how the coach uses CWI to best effect, rather than whether it is appropriate to use it or not!

What is the theory behind Contrast Bathing?

The theory behind contrast bathing is that the hot water stimulates vasodilation of the blood vessels near the surface of the skin and when followed by immersion in the cold water ,which causes vasoconstriction, a ‘pumping action’ ensues, which increases blood circulation.  

Typically, contrast bathing would consist of several cycles e.g. 1 or 2 minutes hot followed by 1 minute cold and repeated 3 times.

In a sporting context contrast bathing is used by some elite sports clubs as an alternative to cold water immersion alone.

There is also some research which supports the theory that the cold is the more critical element and where an athlete has a sustained soft tissue injury with symptoms including a combination of pain, heat & inflammation the application of additional heat would be contra-indicated during the acute phase of the injury (typically the first 48 to 72 hours).

Some research studies have also supported the theory that thermal stress positively influences the auto-immune system.