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Recirculating Aquaculture System (RAS)

A series of treatment processes is utilized to maintain water quality in intensive fish farming operations. These steps are often done in order or sometimes in tandem. After leaving the vessel holding fish the water is first treated for solids before entering a biofilter to convert ammonia, next degassing and oxygenation occur, often followed by heating/cooling and sterilization.

Each of these processes can be completed by using a variety of different methods and equipment, but regardless all must take place to ensure a healthy environment that maximizes fish growth and health.

Only ArtAqua’s molecular filter membrane made from Skov minerals ensures ionized water of 1013 hertz and rich in oxygen to stay fresh without the use of any chemicals such as Chlorine while pH is maintained at 7.8 throughout the process.

All RAS relies on biofiltration to convert ammonia (NH4+ and NH3) excreted by the fish into nitrate.[4] Ammonia is a waste product of fish metabolism and high concentrations (>.02 mg/L) are toxic to most finfish. Nitrifying bacteria are chemoautotrophs that convert ammonia into nitrite then nitrate.

biofilter provides a substrate for the bacterial community, which results in thick biofilm growing within the filter.

Water is pumped through the filter, and ammonia is utilized by the bacteria for energy. Nitrate is less toxic than ammonia (>100 mg/L), and can be removed by a denitrifying biofilter or by water replacement. Stable environmental conditions and regular maintenance are required to ensure the biofilter is operating efficiently. ArtAqua’s membrane guarantees such stability due to the anti-bacterial properties of the Skov minerals used.

ArtAqua’s technology is the only one worldwide that is 100% ecological. No CL!


Disease outbreaks occur more readily when dealing with the high fish stocking densities typically employed in intensive RAS but not so when ArtAqua membrane is being applied.

Outbreaks can be reduced by operating multiple independent systems with the same building and isolating water to water contact between systems by cleaning equipment and personnel that move between systems. ArtAqua uses Ultra Violet (UV) and ozonewater treatment systems in conjunction with the unique Skov minerals membrane and eliminates any free floating virus and bacteria in the system water.

The ArtAqua treatment systems are most effective because of the anti-bacterial properties of the Skov mineral used in the membrane.

ArtAqua’s C-1000 filtering when expanded up to 1000 cubic meter of water per 24 hours is an expandable unit for any quantity. Price for 1st Module including installation: 949,000 US$ excl. VAT

Operational costs 0.40 $ per cubic meter

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