Aquaculture Technology

  Aeration Systems deutsch

Injectors - Propellers - Paddlewheels - Diffusers - Blowers - Generators

Injector Systems

INJECTION AERATORS for aeration, circulation, destratification and oxygenation

This injectors are one of the best and most advanced aeration systems worldwide, and also suitable for large ponds. They work with an for endurance run produced, maintenance free, adjustable, submerged (also seawater resistant), motor in different power sizes (0.37-1.50 kw (0.5-2.0 HP) 230 or 380 V/50 Hz). The rotating propeller (2850 r.p.m.) produces an adjustable current, through which air drawn from the surface and formed into fine evenly distributed bubbles. The diffused air aerate from the bottom up and the circulation created from the fine bubbles displaces the surrounding water, thus breaking up stratified water areas. This constant surge forces the pond to turn over, bringing cooler bottom water to the surface, where it picks up additional oxygen from the atmosphere. Therefore the dissolved oxygen is always as high as possible. Through the eutrophication process (of faces and feeds) there is usually oxygen deficit at depth, therefore this system works to an adjustable depth and introduces the oxygen where it is needed, not only on the surface. If submerged, pure oxygen instead of air can be introduced with exact dosage. Long contact time of the fine bubbles in the water, ensures also this system is very effective. Depending on power and depth, the air flow rate is up to 40 m3/kw/h and the oxygen introduction up to 1 kg/kw/h. At an oxygen content of 6 mg O2/l at beginning, one 1.0 HP unit in use with air, introduce over 0.32 kg O2/h which is the oxygen demand for over 2600 kg (table sized 250 g) trout's at a water temperature of 10 °C, for approx. 1000 kg at 20 °C or up to 3000 kg of other species.
Depending on installation, depth and current, sediments can also be cleaned. If the aerator is positioned near the water surface it also acts as an ice clearing machine in winter. Strong circulation also eliminates pond stratification and organic matter deposition. Finally thanks to the floatation phenomenon (foaming), this aerators make it possible to remove excess algae proliferation, colloidal substances, mud and any other suspended particles and improve water quality. With this proven system, all variants of aeration, current creation and oxygenation are possible. These proven aerators are supplied at reasonable costs (in 2 cartons) as preassembled motor- and float-kit with air suction pipes and propeller protection fingers. They are lightweight compact systems (approx. 20-28 kg), and very easy to install.

Injection aerator Injection aerator in use


INJECTORS without further energy consumption

This "ECO" injector is a new developed static aerator for the water inlet pipe (1 ") in tanks, raceways and small ponds, that works hydraulically and has no moving parts. It is designed to ensure cost-effective use of any viable water source. For degassing, aeration, oxygenation and dosing with chemicals (thereby avoiding the slightest wastage and maximizing efficiency). In enriching the water with air or pure oxygen, this aerator can create good circulation with a lesser amount of water than is usually supplied, with consequent energy savings. It works hydraulically (from 0.2 bar and 0.4 l/sec. on) exploiting the act the water passing through it at high speed (achieved by means of suitable flow rates and pressures with the special 3 interchangeable nozzles (for approx. 30, 50 or 100 liter/minute) and creates a great pressure drop and consequently a tremendous suction capacity, without introducing additional energy. If no pressure is available, this injector can be connected to a pump.

Injector Injector in use

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Propeller Systems

PROPELLER AERATORS with water conveyer

Propeller Aerator in useThis propeller aerator was specially developed for intensive production of fish in tanks, raceways and ponds. The maintenance free, heavy duty, motor (230 or 380 Volt) with low power consumption (0,18-1,00 kw) has a mounted propeller which allows a high water circulation of up to 50-180 m3/h (splash height 60-90 cm and splash diameter 160-250 cm). It allows an oxygen transfer rate of up to 1.25 kg/kw/h or at an oxygen content of 6 mg O2/l at beginning approx. 0.4 kg/kw/h. The small float size (70 x 70 cm) as well as the compact and lightweight system (26-30 kg) make it fast and easy to install. As accessories a stainless steel protection basket (with 4 or 12 mm grating) is available, which save smaller fish for injuries.

The following types are available as standard:

Power consumption kw/HP 0,18/0,2 0,37/0,5 0,75/1,0
Water circulation m3/h 50 100 180
Water splash Ø cm 160 180 250
Splash height cm 60 75 90
weight kg 26 28 30


AERATOR PUMPS with fountain spray pattern

This "Spray" aerator pump with 10-25 m cable is specially suitable for ponds and introduce a lot of oxygen into the water. If the self floating pump is connected with the spray nozzle it becomes an aerator with fountain spray pattern. If the supplied nozzle is changed to the supplied pipe adaptor it can be used as a floating pump for irrigation. The change of these two functions doesn't need any tool. They have a very reasonable price and are easy to install, either floating on the water surface or submerged to depth (with an anchor stone).

Aerator Pump Aerator Pump in use

The following types are available:

Power kw 0.25 0.55 1.10 1.50
Voltage (50 Hz) 220 220 380 380
Capacity m3/h 10 20 30 40
Loading Area m2 500 1000 2500 3000
Water spray m 1-2 2-3 4-6 5-7
Pipe Ø mm 50 65 80 80
Weight kg 8 14 15 16

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Paddle Systems

PADDLEWHEEL AERATORS for intensive production

Paddlewheel AeratorThis paddlewheel aerators widely used all over the world, special in intensive ponds and raceways. They are available with 2-6 paddle wheels, in different power ratings from 0.5 to 2.2 kw (for 220 or 380 Volt/50 Hz) and have (depending on quantity of paddle-wheels) a wide of 1,2 or 2,1 or 2,7 m, a length of 1,6 and a height of 0,9 m approximately, and a weight of 80-120 kg.  It allows an oxygen transfer rate of up to 1.5 kg/kw/h or at an oxygen content of 6 mg O2/l at beginning approx. 0.5 kg/kw/h. Wheel and frame are made of steel, the paddles from special plastic material and the H-formed floats from thick UV- and ozone resistant plastic.


PADDLEWHEEL SYSTEMS for effective oxygen introduction

Aeration and/or oxygenation is specially of economic importance in intensive farms. At this completely new developed systems all possible failures and defects of other known products have been removed. The systems have been tested under hardest conditions and have a very high efficiency, with the same time low investment and operation costs. There are no bearings of the wheel (100-130 r.p.m) necessary and also no couplings and discs, this reduce friction lost and increase the efficiency and also reduce the possible parts which could become defect with time. A very long self live and high efficiency is also guaranteed through the worm-gearing. The motor is specially sealed against moisture. Paddles, wheel and frame are made of stainless steel, the T-formed floats from thick UV- and ozone resistant material.
The paddlewheel aerators are available in different power ratings ( consumption: 250, 370, 550 and 750 Watt) and have dimensions of approx. 1.5 x 1.6 x 0.6 m (LxWxH) and a weight of 30-70 kg. To use this paddlewheel aerators also with pure oxygen instead of air, as accessories a special oxygen cover is available. The special formed cover inside guarantees that no oxygen (feed up to 15 l/min) disperse or waste to the surface, after the water leaves the aerator. As there are no seals necessary at the bearing of the wheel, also this guarantees that there is no oxygen wasted and thus this makes the system very effective too. The efficiency is up to 90 % and the oxygen introduction up to 2-3 kg O2/h.

Paddlewheel aerator Oxygen cover

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Gas Diffusers

RUBBER DIFFUSER with stainless steel frame

Rubber Diffuser with stainless steel frameThis professional, extremely durable and effective diffusers are suitable for the live fish transport and for emergency purposes with pure oxygen. The approx. 1000 pores/meter arranged in 6 rows, of the special oxygen hose open only if oxygen is supplied and close again if the supply stops. Thus, pore blockage is prevented and the diffuser is always ready to operate. An uniform bubble size due to the straight hose mounting in a stainless steel frame are main features of this professional diffusers. The sturdy hose connection has 6 mm diameter as standard (and is also available in 9 mm if preferred).
Other diffuser sizes and forms on request. For the self production of diffusers we deliver also just the diffuser hose per meter (18-19 mm inside and 24-27 mm outside diameter) as well as end pieces with connector and the pressure hose per meter (6 mm diameter).

The following sizes are available as standard:



Width cm 40 40 55 55 55 55 70 70 70 70
Length cm 50 70 70 80 90 100 80 100 120 150



Ceramic DiffusersThis diffusers are robust engineered products with high performance. The ceramic plate has been designed to be strong and thick (approx. 10 mm) which gives a very small bubble size and are used where a small high rate diffuser with a high oxygen transfer efficiency is required. The small pore size of the ceramic plate produces a cloud of tiny gas bubbles (100-400 microns) in the water to reach an oxygen saturation of over 120 %. The gas (oxygen or ozone) flow is optimally up to 1-2 and maximally up to 2-8 l/min, depending on pressure, bus as lower the flow as smaller the bubbles and as higher the efficiency. Efficiency also depends on installation water depth and can be up to 90 %. The working gas pressure is 1.5-2.5 bar and should not be over 3.0 bar as it may result in damage to the diffuser.  The ceramic flat plate diffusers are available with blue aluminum or plastic housing (height 25 mm) in different sizes, have 4 mounting holes and a threaded inlet with adapter (6-8 mm) to connect the pressure hose.






Flow l/min 0.7-2.7 1.0-4.0 1.4--5.5 2.0-8.0
Plate dimensions (LxW) cm 20x6  30x6  40x6  60x6 
Casing dimensions (LxW) cm 27x8  37x8  47x8  67x8 
Weight kg approx. 0.8 1.0 1.4 2.0

The two larger diffusers consist of 2 smaller plates!


Cross-Diffuser (floating)CERAMIC PIPE DIFFUSERS for professional aeration

The fine pored ceramic tubes allow to diffuse the air in fine bubbles. The diffusers should be installed in the same depth, but as deep as possible below the water surface. The floating cross diffuser is placed on the water surface in the center of the tank or pond and fixed with a rope to the shore so that it can move a little and aerate a larger area.
The cross diffusers are available complete with 20 mm hose tail (other on request) and are delivered with or without float. The 1 m long feeding tube is also available shorter. Each diffuser tube has a length of 18 cm and a diameter of 6 cm and can introduce approx. 1.5 to 2.0 m3 air/hour each (6-8 m3 per cross diffuser).
They are also available as self sinking single tube diffusers with hose tail.


GAS DIFFUSERS with high performance

Flexible Gas DiffuserThis is among the most robust and versatile fine bubble diffusers commercially available. The diffuser has the capacity to pass large quantities of air, oxygen or carbon dioxide with low pressure drop and small bubble size (approx. 1-4 mm). Fine bubble diffusion is inherently more effective than coarse bubble diffusers in providing a greater mixing action and aeration efficiency. The diffusers are of a tubular semi-flexible construction (32 mm in diameter). An outer polyester sleeve encases a silica particle ballast and an inner nylon distributor. The internal ballast is not fused together, therefore precipitates such as iron and carbonates tend to crack off, and can be flushed out easily. The internal ballast (weight approx. 1.5 kg/m) means that the diffuser does not need to be anchored to the floor of the tank. The unique design of the diffusers makes them largely resistant to biological and chemical fouling. The diffuser resolves many of the problems associated with other diffusers and has proven itself with over 10 years of use in many industrial and waste water treatment applications and it is the leading air diffuser for aquaculture. This gas diffuser is a hybrid air diffuser with the benefits of both tubular membrane and solid air diffusers, but with few of the disadvantages. The diffusers are sized (up to 3 m in length or longer with extension parts) according to the flow (m3/h) of air to be used. Length is approx. 33 cm per m3/h air or liter oxygen/min flow rate and pressure drop is approx. 200 mbar (<3 psi). All diffusers are supplied with 1/4" to 1/2" hose tails in acetyl plastic.

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Air Blowers


Membrane CompressorThis simple membrane diaphragm compressors supply oil-free air and are perfectly suitable for live fish transports, where the required energy (12 V/DC) can be supplied by a battery i.e. from the car or truck. As accessories 6 mm hoses and various diffusers are available.

The following sizes are available as standard:






Volume max. 70 l/min 90 l/min 105 l/min 125 l/min
Pressure max. 1,0 bar 1,2 bar 1,2 bar 1,3 bar
Power 35 W 60 W 100 W 120 W
Ampere approx. 3 A 5 A 8 A 10 A


SIDE-CHANNEL BLOWERS for water aeration or delivery

Blower Type VThe design of these blowers is based on long experience in blower production. The motor (standard 380 Volt/50 Hz, 2850 RPM) is made for endurance and is offered in different power sizes. The flow capacity based on air at 981 mbar and 20 °C (at the inlet connection) ranges from 110-300 m3/h. Because of the small dimensions and compact construction, as well as the low noise level (45-48 dB), these blowers can be placed almost anywhere. The blowers can be installed singly, in parallel, or in rows for an increase in pressure. On request the blowers can be produced for us in seawater, or for other voltages and frequencies. Air filters, pressure valves and support stands are available as accessories.

The following blowers are available: 

Type (V/T)






Capacity m3/h max. 110 220 150 300 160
Pressure difference mbar max.  330 160 400 200 700
Motor power kw 1,1 1,1 2,2 2,2 4,0
Weight approx. 12/26 12/26 18/38 18/38 22/58

The typical emerged blowers (type V) are installed only on the land, but at almost any location. An advantage in recirculation systems is that the heat in the air of a room can be used to heat the water.
The special submerged blowers (type T) are installed directly in the water and therefore allow shorter piping, as well as lower pressure losses. They are much quieter and also save space. An additional advantage in recirculation systems is that the heat generated by the blower motor will heat water.


REGENERATIVE BLOWERS for pressure or vacuum generation

Regenerative Sidechannel Blower (doubble stage)This reliable and favorable blowers summarize modern know-how of pressure and vacuum generation, based on longtime experiences. The motor is constructed for endurance run is available in various power sizes. Concerning the compact dimensions and the low sound this blowers are easy and everywhere to install. Lateral channel blowers work regenerative. Casing and impeller with radial blades form a circular body. The medium (air) is accelerated by centrifugal force in the blade channels, stocked and compressed. This process continues permanently with continually increasing pressure rising until the medium leaves the casing through the outlet connection. Because of the special principle of construction and design, there is no contact between rotating parts. The machines are delivered as mono stage (M) or double stage (D) blowers with single (S) or twin (T) impeller. As accessories air filters, sound absorbers and security valves are available.

Types with the following performance data* are available as standard:

Pressure mbar 0 100 200 400 600

Pressure max.



Type-Mono stage m3/h (kw) m3/h (kw) m3/h (kw) m3/h (kw) m3/h (kw)

mbar (kw)



00-MS 55 (0.20)        

  90 (0.20)



03-MS 74 (0.37) 39 (0.37)      

150 (0.55)

1 1/4


04-MS 137 (0.75) 96 (0.75) 55 (1.10)    

250 (1.50)

1 1/2


05-MS 219 (1.10) 166 (1.10) 113 (2.20)     300 (3.00) 2 30.5
06-MS 304 (2.20) 242 (2.20) 181 (3.00)     340 (4.00) 2 35.2
07-MS 412 (2.20) 334 (2.20) 255 (3.00) 96 (5.50)   400 (7.50) 3 61.5
08-MS 536 (3.00) 450 (3.00) 363 (5.50) 190 (7.50)   450 (9.20) 3 77.5
09-MS 663 (4.00) 570 (4.00) 477 (5.50) 291 (11.0)   450 (11.0) 4 87.5
10-MS 782 (5.50) 684 (5.50) 586 (7.50) 389 (11.0)   500 (15.0) 4 95.0
11-MS 915 (5.50) 812 (5.50) 708 (9.20) 501 (15.0)   450 (18.5) 4 128.5
Type-Double stage m3/h (kw) m3/h (kw) m3/h (kw) m3/h (kw) m3/h (kw) mbar (kw) Inch kg
10-DH 30 (0.37) 15 (0.37) 2 (0.37)     200 (0.37) 1/2 10.0
15-DH 50 (0.55) 37 (0.55) 25 (0.55)     300 (0.55) 3/4 12.5
20-DH 72 (0.37) 51 (0.37) 35 (0.55)     350 (1.10) 1 1/4 21.5
30-DH 103 (0.37) 79 (0.55) 61 (0.75) 26 (1.50)   400 (1.50) 1 1/2 26.5
40-DH 144 (0,75) 118 (1.10) 95 (1.50) 55 (2.20)   500 (3.00) 1 1/2 36.5
07-MD 181 (2.20) 165 (2.20) 150 (2.20) 122 (3.00) 97 (5.50) 650 (5.50) 3 64.5
08-MD 236 (3.00) 219 (3.00) 202 (3.00) 173 (5.50) 148 (7.50) 650 (7.50) 3 72.0
09-MD 311 (4.00) 288 (4.00) 268 (4.00) 229 (5.50) 196 (7.50) 725 (9.20) 4 90.5
10-MD 387 (5.50) 358 (5.50) 331 (5.50) 283 (7.50) 249 (9.20) 750 (11.0) 4 92.5
11-MD 431 (5.50) 402 (5.50) 375 (5.50) 325 (7.50) 282 (11.0) 750 (15.0) 4 108.0

*Performance data at pressure operation 50 Hz (= 2900 RPM), for air at 20 °C, pressure 1013 mbar, tolerance +/- 10 %.

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Oxygen Generators

OXYGEN GENERATOR SYSTEMS for intensive aquaculture

Oxygen GeneratorIn recent years, fish farming has turned into high density farming practice and pure oxygen is essential in modern aquaculture. Several studies have shown adding dissolved oxygen into water on fish farms has a very positive effect on growth rates, feed conversion and mortality rates, all factors that will affect the profitability significantly. On-site oxygen generators allow an uninterrupted supply of gas with a high purity output (adjustable 85-95 %, outlet pressure 4 bar). This means that you can produce gas where and when you need it, and in the exact quantity and quality you need, to reach gas self-sufficiency and independence from external gas suppliers.  This oxygen generators are known as reliable, easy to use and low operational cost. They save energy and money as supply of oxygen cylinders or rent of liquid oxygen tanks becomes irrelevant. The average oxygen production cost are about 1,1 kwh per cubic meter of oxygen. An oxygen generator combined with cylinder gives the highest level of backup in comparison with cylinders it gives overall cost reduction up to 80 %. We use only high quality components and all systems are designed for 24 hours, 365 days a year’s operation. They are easy to operate and require minimum amount of maintenance and service.
This proved generators are based on the well-known PSA (Pressure Swing Adsorption) technology, using two pressurized columns with molecular sieves to ensure continuous production. Dry compressed air is blown through a valve to the vessel where the pressure is built to reach 5 to 10 bar. Nitrogen is tied to a molecular sieve during the building of pressure and oxygen is allowed to pass through to the accumulation tank. While pressure is built in vessel, the second remains without pressure. A part of the produced gas is used for regeneration of the molecular sieve. The entire PSA system can be subdivided into several components like: air compressor, air dryer, air tank, oxygen generator, oxygen tank and accessories. The models are available with a capacity in the range from under 1 to over 400 m3/hour (at an oxygen purity of 90 %). Oxygen cylinder filling stations are available on request.

The following models are available as standard:


O2 kg/h

O2 m3/h Consumption* Tanks Weight
OM-020 2,4 1,7 2,7 kw 90 l 354 kg
OM-040 3,5 2,5 3,6 kw 90 l 384 kg
OM-060 5,0 3,5 4,8 kw 90 l 446 kg
OM-070 6,7 4,7 6,5 kw 150 l 653 kg
OM-102 10,5 7,4 9,1 kw 320 l 836 kg
OM-170 14,9 10,5 10,7 kw 320 l 1086 kg
OM-230 21,4 15,1 14,3 kw 470 l 1416 kg
OM-234 28,5 20,1 21,0 kw 470 l 1455 kg
OM-333 37,6 26,5 23,7 kw 750 l 2220 kg
OM-335 44,2 31,1 28,4 kw 750 l 2312 kg
OM-503 67,0 47,2 42,1 kw 1000 l 3548 kg
OM-600 84,1 59,2 60,0 kw 1500 l 4605 kg

The stated flows in m3/hour are for operation with reference to 15°C, 981 mbar, inlet pressure 7 bar, flow variance ±5%, oxygen purity 90 %, purity variance ±1%.
Conversion rates for oxygen: 1 m3 = 1,43 kg; 1 kg = 0,70 m3.
* incl. compressor, dryer and generator.

We deliver also oxygen cylinders, pressure reducers, flow meters and pressure hoses!

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