Recirculating Aquaculture System (RAS)

Hydrotech filters act as an absolute filtration step and remove over 90% of solid particles.

Fish farming in recirculating systems is expanding in the aquaculture industry. In Recirculating Aquaculture Systems (RAS), effluent water is treated to restore its quality and allow the reuse of more than 90% of intake water. 

A key point is particle removal. Hydrotech filters have particle removal efficiencies of over 90%. 

Our team of biologists and engineers work together with your design teams to ensure particles are not dissolved or destroyed before they reach the screen – and to make sure the system brings maximum efficiency.

The steps usually required in a modern RAS are:

  • Solids removal
  • Ammonia and organic matter removal
  • Oxygenation
  • Carbon dioxide degassing
  • Disinfection

Our microscreens remove major loads from the biofilter and act as an absolute filtration step, removing parasites from the recirculation loop. This feature has become a crucial success factor in some installations such as eel farms.

The benefits of Hydrotech filters:

  • ALPHAFLEX™ patented screens with high efficiency
  • Small footprint
  • Low impact and load on the natural environment
  • Reduced energy costs
  • Easy maintenance and monitoring of performance
  • 30 years of experience in the aquaculture industry
Hydortech drumfilters


If you have any questions about our solutions or can’t find the information you are looking for, please contact us.

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There are over 12,000 Hydrotech filter units installed around the world. 

Contact us for references related to your specific needs.

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Contacts Aquaculture

Mads Winkler

​​​​​​​Mads Winkler

Aquaculture Sales Manager
phone: +4640429992
e-mail: [email protected]

William Conn

William Conn

Aquaculture Sales Manager
phone: +46761355376
e-mail: [email protected]

Angélica Escobar

Angélica Escobar

Sales Executive Aquaculture, Chile
+56 9 39186954
[email protected]