Unique, multifunctional and economical water treatment technology


Hydraulic circulation


Management of dissolved gases


Particulate extraction

Discover our VALTM process:

A technological innovation

We have developed and marketed an innovative vacuum airlift column process, the result of groundbreaking research between IFREMER and INSA Lyon. We offer reliable, high-performance and energy-saving turnkey solutions, the 3 main functions of which can be used separately or in any combination.

Benefit from a global service for your projects

Complete services

COLDEP is able to provide a complete solution to the client's needs, and can support them in their projects by offering a TURNKEY SOLUTION, which includes:

Project study

Production and supply

On-site installation

Assistance and follow-up

discover our different business sectors

Many fields of application

As a separation process, the COLDEP system can be used to purify water, recycle it or adapt it to the needs of an industrial process. It is also a process for concentrating, extracting and collecting suspended matter in water such as biomass and valuable substances. Our system has applications in aquaculture, the food industry, as well as in the treatment of industrial effluents, the oil industry and many other fields. We are constantly developing our range of applications. Contact us if you want to know more or test our system.

Fish farming

Improve the performance of your fish farming facilities with our system which combines degassing and particulate extraction!



Make your raceway microalgae culture more efficient. Water circulation, management of dissolved gases and concentrated harvest combined in a single device!

Shellfish farming

Purify the water of your shellfish with our process to obtain unparalleled biosecurity and oxygenation performance.


Improve the quality of your aquarium water for transparent and pure water.

Water purification

Treat and recycle your wastewater and industrial effluents. The COLDEP system treats water from industry and sewage treatment.

Seawater treatment

Pretreat seawater before use in your projects: deoxygenate, purify and pre-desalinate.

CO₂ bioremediation

Use our system in your carbon-free projects.

Other applications

Our technology can benefit many other fields of application

stand out with a competitive system

Multiple advantages

Innovative and original, our column system was developed from extensive research on fish farming, resulting in two patents and a thesis. The COLDEP column is innovative, by definition. Its original design offers solutions to what where the usual limits of water treatment.




Easy to maintain


Reliable & Durable





eco-light (1)


Join those who trust us

A panel of partners

Discover below our main partners in the many areas where our technology is used. We have more than 80 successful installations worldwide.

marseille fos
total energies
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