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

Application areas

The main difficulties encountered with RAS (water recirculation) systems in aquaculture are addressed with Coldep's VAL solution.

  • Superior product quality thanks to better water quality (oxygenation and treatment of particles: from viruses to micro-algae)
  • Low initial investment by replacing multiple single-function components
  • Reduced operating costs thanks to high energy efficiency and elimination of chemicals

Fish farming

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


Shellfish farming

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

Industrial effluents in the food industry

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Industrial effluents in Chemistry

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


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

Seawater treatment

Pre-treat seawater before use for your projects: Deoxygenation, Purification and Pre-desalination.


Use our system in your carbon-free projects.

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