The high-volume air source for deep, high-density aeration — a positive-displacement roots blower (rotary lobe) that delivers large, steady air volumes at medium pressure to feed nano-tube diffusers and bottom aeration grids in biofloc tanks, RAS and intensive ponds, with twin/three-lobe rotors, 100% oil-free air and rugged 24/7 continuous duty.
15+ years in aquaculture engineering · Trusted by Japfa Group, Japan Nissui & Tropo Farms · Shipped worldwide in one container
Roots blower (dry type roots vacuum pump), are positive displacement machines consisting of a pair of three-lobe rotors machined with high precision, rotating inside an oval shaped casing at the same speed, but in opposite direction, driven by two synchronous gears.
Benefit
Save 60-80% power consumption
Larger aeration quantity and deeper bottom aeration.
Our videos recorded by customer, If you need installation and operation videos, contact us directly, our engineers will answer your questions,
3HP for 2000m2 water areas
15HP for 5000m2 water areas.
Yes, we supply diffuse nano hose, and connection accessories.
Minimum Order Quantity 3 sets
Wooden box, sea freight suitable.
110v, 220v, 380v available.
SIGMA Aquaculture (SIGMA INDUSTRIES CO.,LTD)located in North of China Shandong Province, We have 15 years experience in Aquaculture equipments manufacturing. Our factory focus on Biofloc fish tank producing. Both PVC and HDPE material available. We also provide relevant equipments from partners for customers. such as aeration equipments and accessories.
Specifications
Model series integrated from the industry standard range as an indicative guide — actual ratings are confirmed by SIGMA before shipment.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-RB-15 | Single biofloc tank / small pond | ||
| SIGMA-RB-30 | Mid-size pond / multi-tank | ||
| SIGMA-RB-55 | Large pond / parallel ponds | ||
| SIGMA-RB-75 | Farm-scale bottom aeration manifold | ||
| SIGMA-RB-110+ | Very large farms / RAS main air source |
| Type | Positive-displacement rotary lobe (twin / three-lobe roots blower) |
|---|---|
| Air quality | 100% oil-free — rotors never touch, clean air for fish health |
| Duty | Continuous 24/7 operation |
| Standard package | Inlet filter/silencer, pressure relief valve, drive motor, belt guard |
| Options | Frequency converter (VFD), acoustic enclosure, stainless pipework, pressure gauge |
| Voltage / frequency | 220 / 380 V · 50/60 Hz · three phase |
| Water type | Freshwater / seawater (with corrosion-resistant pipework and diffusers) |
System composition
Positive-displacement design keeps air flow near-constant under small back-pressure changes — exactly what deep-water, high-density aeration needs.
The lobed rotors never touch, so the air stays clean — no water pollution, no diffuser fouling, no risk to fish health.
Pairs naturally with fine-bubble nano diffuser tubes and air-stone grids to maximise oxygen-transfer efficiency at depth.
Designed for long, unattended continuous running with few wear points.
A frequency converter matches air output to live oxygen demand, saving energy over long run hours.
Ships with inlet filter/silencer, relief valve and motor — ready to connect to the aeration manifold.
Application
FAQ
It is a positive-displacement blower that delivers large, steady air volumes at medium pressure to feed nano-tube diffusers and bottom aeration grids in Biofloc tanks, RAS sumps and intensive ponds.
A Roots blower pushes air to depth through diffusers for deep-water, high-density aeration, whereas a paddle wheel works the surface. The Roots blower supplies the volume and reliable pressure that bottom diffusers need.
Yes — the meshing lobed rotors don’t touch, so the air is 100% oil-free, protecting fish health and avoiding diffuser fouling, and it is rated for continuous 24/7 duty.
It is selected by required air volume (m³/min) and working pressure (kPa) based on tank depth and diffuser count, from small 1–2 HP units for a single Biofloc tank up to large twin-lobe blowers; a VFD can match output to live oxygen demand.
Related equipment
Micro/nano-bubble oxygen diffuser pipes & aeration hose for biofloc and pond fish farming — fine bubbles, high oxygen transfer, clog-resistant. Factory-direct from SIGMA. Get a quote.
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High-pressure regenerative (ring) blowers for aquaculture aeration, RAS & biofloc — oil-free, quiet, energy-efficient. Multiple capacities, factory-direct from SIGMA. Get a quote.
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Energy-efficient paddle wheel aerators for shrimp & fish ponds — strong circulation & oxygen transfer, durable impellers. Multiple sizes, factory-direct from SIGMA. Get a quote.
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Complete recirculating aquaculture (RAS) systems: drum filters, biofilters, oxygen cones, pumps & monitoring. Custom-designed for your species & volume. Manufacturer-direct. Get a quote.
View details →Tell us your species, target density and site — our engineers size the system and reply within one business day.
