Large, constant air volume
Positive-displacement design keeps air flow near-constant under small back-pressure changes — exactly what deep-water, high-density aeration needs.
Root Blower
A roots air blower for aquaculture (positive-displacement rotary lobe type) delivers large, steady air volumes at medium pressure to nano-tube diffusers and bottom aeration grids in biofloc tanks, RAS and intensive ponds. Available as twin lobe roots blower and tri-lobe configurations, SIGMA's roots blower for sale covers the full range from small 1 HP units to large farm-scale blowers. The lobed rotors never touch, so the air is 100% oil-free, and the blower is built for 24/7 continuous duty.
- Power1.5–11+ kW
- Air volume1–22 m³/min
- Pressure20–90 kPa
- Air100% oil-free · 24/7 duty
ISO 9001 CE OEM / ODM
15+ years in aquaculture engineering · Trusted by Japfa Group, Japan Nissui & Tropo Farms · Shipped worldwide in one container
Product Description
Roots Blower for Aquaculture: Steady, Oil-Free Air for Bottom Aeration
SIGMA Aquaculture supplies aeration roots blowers for biofloc tanks, RAS and intensive ponds — positive-displacement lobe blowers that deliver a large, constant air volume for deep bottom aeration, with the matching diffuser hose and fittings.
A roots blower is a positive-displacement air blower in which a pair of precision-machined three-lobe rotors turn at the same speed in opposite directions inside an oval casing, driven by two synchronous gears. The rotors never touch, so the air stays 100% oil-free and the machine can run continuously — the properties that make the lobe roots blower the standard air source for aquaculture bottom aeration.
Compared with surface aeration, a roots air blower pushes larger air volumes deeper, aerating from the tank floor upward. As a sizing rule of thumb, roughly 3 HP serves 2,000 m² of water area and 15 HP serves about 5,000 m². Blowers pair with nano aeration tubes, and SIGMA supplies the diffuser hose and connection accessories alongside the blower so the aeration grid arrives as one matched order.
In recirculating systems the blower drives the biofilter and airlift stages — see the RAS equipment guide — while high-density farms add a dissolved oxygen cone for the pure-oxygen peaks that air alone cannot reach. Motors are available for 110 V, 220 V and 380 V supply.
For single tanks or hatchery duty where less airflow is needed, the regenerative air blower is the lighter-duty alternative SIGMA also supplies — quieter and gearless, but without the deep-water air volume of a twin lobe or tri-lobe roots blower.
Advantage
Non-contact lobe rotors deliver 100% oil-free air around the clock — no oil in the water, no diffuser fouling, and a constant air volume that keeps bottom aeration and biofloc suspension stable.
Specifications
Models & configuration
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 | 1.5 kW (~2 HP) · 1–2 m³/min · 20–50 kPa | Single biofloc tank / small pond | Tri-lobe roots · oil-free |
| SIGMA-RB-30 | 3.0 kW · 3–5 m³/min · 30–60 kPa | Mid-size pond / multi-tank | Tri-lobe roots · oil-free |
| SIGMA-RB-55 | 5.5 kW · 6–9 m³/min · 40–70 kPa | Large pond / parallel ponds | Tri-lobe roots · oil-free |
| SIGMA-RB-75 | 7.5 kW · 9–12 m³/min · 40–80 kPa | Farm-scale bottom aeration manifold | Tri-lobe roots · oil-free |
| SIGMA-RB-110+ | 11 kW and up · 13–22 m³/min · 50–90 kPa | Very large farms / RAS main air source | Tri-lobe roots · oil-free |
| 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
100% oil-free air
The lobed rotors never touch, so the air stays clean — no water pollution, no diffuser fouling, no risk to fish health.
Best match for bottom aeration
Pairs naturally with fine-bubble nano diffuser tubes and air-stone grids to maximise oxygen-transfer efficiency at depth.
Built for 24/7 continuous duty
Designed for long, unattended continuous running with few wear points.
VFD option cuts power
A frequency converter matches air output to live oxygen demand, saving energy over long run hours.
Complete package from the factory
Ships with inlet filter/silencer, relief valve and motor — ready to connect to the aeration manifold.
Same rotary-lobe principle as Howden, Aerzen, Robuschi
Roots pump, Roots blower compressor, twin lobe air blower — different names for the same three-lobe rotary technology used by the big industrial brands, scaled here for pond and biofloc duty from small 1 HP units to large farm-scale packages.
Application
- Biofloc tank farming — the core air source for bottom nano-tube aeration and floc suspension
- RAS sump / aeration-stage air supply
- Bottom aeration of high-density grow-out and nursery ponds
- Aeration of sludge-discharge zones in lined shrimp ponds
- Wastewater-treatment aeration basins (cross-industry duty)
Gallery
Roots blowers staged in the SIGMA workshop
Logistics
Package and Shipment
Blowers are shipped on pallets or packed in wooden boxes, sea-freight suitable and loaded into containers; the minimum order is 3 sets.
FAQ
Frequently asked questions
What is a Roots blower used for in aquaculture?
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.
How does a Roots blower differ from a paddle wheel?
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.
Is the air from a Roots blower oil-free?
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.
How is the right Roots blower size chosen?
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.
What is the difference between a twin lobe and tri-lobe roots blower?
A twin lobe roots blower uses two meshing lobes per rotor and is the classic Roots configuration — lower cost and suitable for most aquaculture duties. A tri-lobe design adds a third lobe, which reduces pulsation and noise at the same flow and pressure, making it the preferred choice for continuous 24/7 biofloc and RAS aeration duty. SIGMA supplies both formats; tri-lobe is standard on our production range.
What size roots blower do I need for a biofloc tank — and is a 1 HP unit enough?
For a single standard biofloc tank (Ø 5 m, ~25 m³) a 1 HP roots blower for biofloc delivers roughly 1–2 m³/min at 20–50 kPa — sufficient for bottom nano-tube aeration and floc suspension in one tank. For multiple tanks or deeper water columns, step up to a 3 kW or 5.5 kW blower. Match the air volume (m³/min) and working pressure (kPa) to your diffuser count and tank depth, and we will confirm the right model.
Is a Roots blower the same as a Roots pump, vacuum pump or compressor — and how does it compare to Howden?
A Roots blower, Roots pump, Roots-type blower and twin lobe air blower all describe the same rotary lobe technology; the same lobes are marketed as a roots blower vacuum pump or roots blower compressor depending on whether the ports pull vacuum or push pressure. Industrial brands like Howden roots, Aerzen and Robuschi build this twin- or tri-lobe principle at large industrial scale — SIGMA's aquaculture roots blower is the identical rotary lobe design, sized down for pond and biofloc duty. Roots blower price depends mainly on air volume (m³/min), working pressure (kPa) and motor size, so a small 1–2 HP unit costs far less than a 10+ HP farm-scale package — contact us with your tank size for a quote.
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Tell us your species, target density and site — our engineers size the system and reply within one business day.
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