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RAS for sale

Recirculating aquaculture systems (RAS) +1 more

Swansea University is currently considering offers in the region of £50,000 for an entire a recirculating aquaculture system (RAS).

All items are to be sold together, not separately, and the buyer needs to pay for removal from room and site.

System specification

Livestock tanks

21 circular polypropylene fish rearing tanks (1.5m diameter, 1m working depth). Central drainage/ overflow capacity, external vortex filtration for removal of large waste particles.

The RAS at Swansea


  • Protein skimmer: IAT manufacture, 1.96m D, 2.8m H, Volume ~8.5m3. 32mm venturi.
  • PABR: twin-packed aerator and biological reactors x 2, 1.95m D, 2.8m H, total packing volume 5m3.
  • Reflux sand filter: Lacron LCX 1850 pressure sand filter. 1.8m D, 2.1m H. Filtration area ~ 5.4m2.
  • Air blower (for PABR): Rietschle Thomas side channel blower. RER350/50 1.1kW.
  • Oxygen injection flooded vessel: Astral poly-wound GRP body 1.05m D, 2.3m H.
  • Backwash storage tank: IAT manufacture, 1.96m D, 2.8m H. Volume ~ 8.5 m3.
  • A number of support pumps.

Design parameters

Dissolved oxygen to be maintained at 90-100% saturation. pH adjustable over range of 7.8-8.1 for seawater and 6.5-7.5 for freshwater. Ammonia <0.5mg/l, nitrite < 0.5mg/l. Biomass loading 20kg/m3, anticipated feeding rate 3%, water exchange 50-200% per hour 800-3500l/hr.

For more information, please contact Paul Howes at