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Pre-designed tanks and modules.

Two system types, parametric hybrid and RAS, in two delivery formats: independent production units and production modules. Tank range Ø10 to 30 m. Engineered once, delivered many times.

Product range

Two system types, two delivery formats.

Pick the delivery format that fits your site and the system type that fits your water. Every combination is pre-designed, from Ø10 to 30 m.

Delivery format

Independent production unit (IPU)

One tank, its own water treatment.

Delivery format

Production module

Several tanks, one treatment system. Flexible grouping and layouts.

System type

Parametric hybrid

No biofilter · seawater and freshwater

Parametric hybrid · IPU

Hybrid IPU

Drum filter, degassing and oxygenation in an active loop beside the tank. Low water exchange, with feedwater adjustable on a sliding scale.

Parametric hybrid · Production module

Hybrid module

The same treatment loop shared by a group of tanks. Water is exchanged only within the module.

System type

RAS

Biofilter in the tank · freshwater

RAS · IPU

RAS IPU

Biofilter in the centre of the tank, with its own treatment unit. Switch to hybrid mode in seconds to isolate the biofilter from the fish.

RAS · Production module

RAS module

A group of RAS tanks with individual biofilters, served by shared infrastructure.

The trade-off it removes

Stop choosing once for the whole facility.

Land-based farmers usually choose between recirculation — control at an energy cost — and flow-through — simplicity with more exposure to the intake water. Ontec’s parametric hybrid gives an active treatment loop with far less water in and out than a conventional hybrid. In a RAS system, each tank can switch to hybrid mode or flow-through as the fish, the water and the season require.

How the water moves

Two system types, one principle.

Parametric hybrid has no biofilter: an active loop filters, degasses and oxygenates the water, so far less water goes in and out than in a conventional hybrid, and the feedwater can be set on a sliding scale. RAS adds a biofilter in the centre of the tank, for freshwater, and can switch to hybrid mode or flow-through when needed.

No biofilter · adjustable feedwaterFig. 01 · Schematic

Render of a parametric hybrid independent production unit

Water exchangeLow, adjustable

Treatment loopDrum filter, degassing, oxygenation

Typical useEveryday operation, seawater and freshwater

RAS, made safer

Isolate the biofilter in seconds.

Switch a RAS tank to hybrid mode and its biofilter is cut off from the fish in seconds. That is a new layer of biosecurity.

Operators rebalance water chemistry in the tank and in the biofilter, for example by raising nitrate (NO₃) levels, before restoring RAS mode.
The hydrogen sulphide (H₂S) risk of a biofilter stays confined to a single tank.
Fish can be purged before harvest in the same tank.

Together, this significantly reduces the risk of mass mortality.

Parametric hybrid, measured

What leaving out the biofilter changes.

Results from two production cycles and the modelling done at Ontec Academy.

≥ 50 %

Less new water

Compared with conventional hybrid flow-through.

≈ 20 %

More volume per tank

Farming volume gained when the central biofilter of a RAS tank is left out.

10 mg/l

CO₂ at 126 kg/m³

Stable water quality, with CO₂ below 11 mg/l through the cycle and ammonia well within limits.

Days

Time to respond

Instead of minutes. Most night-time alarms can wait until the morning shift.

No acid or base dosing, and no biofilter to mature or protect. Modelled energy for temperature control is about 0.4 kWh per kg of fish at 10 °C with local seawater temperatures.

Why it matters

Simplification and safety by design.

Conventional plants pipe every tank to one central treatment building, through large pipes in the ground. Ontec treats water at each tank or small group of tanks, so little more than floor drains goes under the floor.

Illustration of a conventional plant: tanks piped to a central treatment building through long underground pipe runs — Conventional · centralisedLarge underground pipes, shared water

Illustration of an Ontec tank with its own compact treatment unit alongside, on a single slab — Ontec · tank-levelTreatment beside the tank, piping in the fundament

Floor drains

Simpler civil works

No large consolidated pipes in the ground, with the flanges and valves they bring, and far less concrete and ground work.

Clean split

Clear interfaces

A simple boundary between building and civil works and the process plant installation.

Per tank

Biosecurity

Tanks don’t share water. In a facility built on IPUs, each tank stands alone; in modules, water is shared only within the module.

60–70 %

Lower capex

Of the industry-average capex per kg, thanks to simpler piping and concrete, a standardised design and a better area-to-volume ratio.

Water treatment

Clean water in, treated at the tank.

Water is drawn from the intake, pre-treated, and handled at each tank or tank group by its own compact unit.

Energy and water

Water use set per mode.

Parametric hybrid runs an active treatment loop with low water exchange, adjustable on a sliding scale. RAS exchanges under 1% of volume per hour. Fewer pumps and short water transport keep energy use down.

Built to build

Simpler groundwork, staged growth.

Piping is pre-designed into each tank’s fundament, so little more than floor drains goes under the floor. That means simpler groundwork, concrete and piping. Facilities grow in stages, without major construction noise. Ontec puts the cost at 60–70% of the industry average capex per kg.

Render of Ontec’s independent production units: two tanks with their own treatment equipment

Control and monitoring

Run by parameters, not guesswork.

The control calculates what each tank should measure. Continuous sensors, which drift over time, and precise spot measurements of pH and ammonia are checked against that prediction, and any deviation carries information. Operators see every tank in one view. The control system was developed with Sætren and Piscada, with a live dashboard for biological and technical performance.

Measured at the tank

Measurement and control sit next to each other, with short water transport.

Mode set per tank

Water chemistry, gas control and temperature are steered tank by tank.

Deviations tell you what to check

pH changes not explained by predicted respiration can point to disease or stress. Feed control shows over- and underfeeding, or that something affects digestion or feed quality.

Automatic control, decision support and early warnings: biological and technical expertise built into the system.

Water quality instrument showing salinity, pH and oxygen readings

Ontec control · Hall AIllustrative values

6 tanks3 hybrid2 RAS1 flow-through1 alert

Tank range

Pre-designed from Ø10 to 30 m.

Fibreglass tanks for the smaller sizes, concrete for the larger. Water depth grows with diameter, which sets the volume. Any size between Ø10 and 30 m can be pre-designed; these six are the standard range.

Standard tank range
Tank	Material	Water depth	Volume (m³)
Ø10 m	Fibreglass	4 m	≈ 310
Ø12 m	Fibreglass	4 m	≈ 450
Ø15 m	Fibreglass	5 m	≈ 880
Ø20 m	Concrete	6 m	≈ 2,000
Ø22 m	Concrete	7 m	≈ 2,800 · first commercial stage in Måløy
Ø30 m	Concrete	8 m	≈ 6,000

Approximate volumes for parametric hybrid tanks. In a RAS tank, the central biofilter takes up about a fifth of the volume.

Request a spec sheet

Compared with conventional systems

Where Ontec differs.

Ontec’s two system types next to conventional RAS and flow-through, in plain terms.

Ontec parametric hybrid and RAS compared with conventional RAS and flow-through
Aspect	Ontec · Parametric hybrid	Ontec · RAS	Conventional RAS	Flow-through
Water	Seawater and freshwater	Freshwater	Freshwater or seawater	Seawater or freshwater
Biofilter	None	In each tank; isolated in seconds by switching to hybrid mode	Central, shared by all tanks	None
Water exchange	Low; feedwater adjustable on a sliding scale	Under 1% of volume per hour	Under 1% of volume per hour	≈80% of volume per hour
New water, m³ per kg feed	4–8	0.5–2	0.5–2; 0.05–0.2 with denitrification	40–60
Shared water	None between IPUs; within the module only	None between IPUs; within the module only	All tanks share loops through a central plant	Directly exposed to intake water
H₂S risk	No biofilter, no biofilter-related H₂S	Confined to one tank	Can affect the whole facility	—
Under the floor	Floor drains; piping in the tank fundament	Floor drains; piping in the tank fundament	Large consolidated pipes in the ground	Large intake and outlet works
Off-flavour purging	In the same tank	In the same tank, in flow-through mode	Separate purge step or tanks	Limited control
Design approach	Pre-designed, plug-and-play units	Pre-designed, plug-and-play units	Central plant designed for each site	Intake and outlet works designed for each site

FAQ

Questions engineers ask.

Not covered here? Ask the team directly.

Can one facility run different modes at the same time?

Yes. In a RAS system, each tank switches independently between RAS, hybrid and flow-through.

Do I need a biofilter?

Parametric hybrid systems don’t use a biofilter. Our RAS systems can bypass the biofilter and switch to hybrid mode at any time.

How do you handle off-flavour?

By purging in the same tank before harvest. In an independent production unit, the fish don’t have to be moved.

Can RAS with a biofilter run on seawater?

Yes, but running a biofilter on seawater is more complex and carries a higher risk of hydrogen sulphide (H₂S) forming. Where seawater is available, our parametric hybrid system gives the benefits of RAS without that complexity and the added risk.

Can Ontec units go into an existing facility?

Yes. Upgrades are where many projects start: replacing old tanks, building an extension or adding a new section. See Facilities.

What water supply does a site need?

It depends on species, capacity and mode mix. We assess intake water, temperature and volumes in the feasibility study.

Can we build in stages?

Yes. Pre-engineered modules are designed for staged development.

What does operator training include?

Practical operation, maintenance, critical operations and industrial production of salmon, on our working site in Måløy. See Ontec Academy.

How long does a project take?

It depends on scope and site. You get a timeline with the feasibility study. Pre-designed units keep the build short: a concrete tank has a known build time of about four months from completed design.

Spec sheets

Spec sheets for the Ø10–30 m range.

Tell us the tank size, the product type and your site, and we’ll send the spec sheet with a first sizing.

Request spec sheets

Planning an upgrade or a new facility? Let’s look at your site.

Talk to the engineers, or come and see the system in Måløy.

Book a technical meeting Visit Måløy

The Måløy facility lit from inside at dusk