Removes dissolved organics at the source
Proteins and organics are stripped before they decay into ammonia, directly cutting the load on the biofilter.
Protein skimmer filter
Strip dissolved organics before they pollute — an aquaculture protein skimmer (foam fractionator) that uses fine micro-bubbles to lift dissolved organic compounds, proteins and fine suspended solids out of the water as foam, before they break down into ammonia. It reduces biofilter load, raises dissolved oxygen and pairs with ozone — ideal for seawater RAS.
- Capacity3–100+ m³/h
- BubblesVenturi / pump-driven
- BuildPP / FRP / LLDPE
- Best forSeawater RAS
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
Protein skimmer has a unique structure and uses the PEI potential energy intake invention patent technology and N-type water vapor mixture of multiple cutting technology, to produce a large number of tiny bubbles, with the effect of surface tension, attract particulate dirt and soluble organic compounds mixed in water, through the flotation principle, removed the aquaculture wastewater suspended colloid, cellulose, protein, feed and manure, and other organic matter. And the configuration of the airflow control valve and liquid level control valve can make the protein separator gain the best effect in different working conditions.
Advantage:
- Energy saving, low power jet pump
- The protein skimmer in double function with coarse filter and protein separation
- Practical and water saving, discharge the foam directly by an inclined tube, no-clean to save water
- Can remove proteins and other organic matters before being changed into ammoniation and other toxic substances, to avoid the accumulation of toxic substances in the water, remove the humus stuff, to make water clean, and remove organic acid to make PH stable.
- Repeated N shape water and air mixed cutting technology, produces rich and exquisite bubbles, to remove the residual baits, feces, colloidal solids, and organic matter efficiently. Reduce loading of biological filter, increase water’s dissolved oxygen, and make sure a safe aquaculture water quality.
- The protein skimmer has an Emptying and Blow-down device on the bottom, more clean and sanitary.
- Can work as an ozone reaction tower, and has the function of disinfection, sterilization, and algae removal, while increasing the protein separation effect.
- This protein skimmer is suitable for industrial aquaculture and various occasions that need protein separation
Video of Product
Application
Specifications
Models & configuration
Flow ranges reference proven industry series — final specifications are confirmed by SIGMA's production line per project.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-PS-3 | 3–5 m³/h | Small systems / hatchery | |
| SIGMA-PS-10 | 10 m³/h | Small farms | |
| SIGMA-PS-30 | 30 m³/h | Mid-size farms | |
| SIGMA-PS-60 | 60 m³/h | Mid–large farms | |
| SIGMA-PS-100+ | 100 m³/h and up | Large / seawater farms |
| Working principle | Micro-bubble foam fractionation — organics attach to bubble surfaces and exit as foam |
|---|---|
| Flow per unit | Approx. 3–60 m³/h per unit; larger custom or parallel installation |
| Bubble generation | Venturi injector or pump-driven micro-bubbles |
| Housing | Corrosion-resistant PP / FRP / rotomolded LLDPE — seawater-ready |
| Best conditions | Most effective in seawater; usable in freshwater at lower efficiency |
| Options | Ozone port (pair with ozone generator for extra clarity and disinfection), foam collection cup, level control |
System composition
Micro-bubble foam fractionation
Fine bubbles give a huge attachment surface, extracting dissolved waste and fine solids for visibly clearer water.
Raises dissolved oxygen
Intensive gas–liquid contact aerates the water while it cleans.
Built for seawater RAS
Skimming efficiency peaks in salt water — the natural fit for marine fish, shrimp and ornamental systems.
Ozone-ready
An optional ozone feed oxidises organics, boosting both skimming efficiency and biosecurity — the combination used in most integrated RAS.
Corrosion-proof, low maintenance
PP/FRP/LLDPE bodies run continuously on low power with little attention.
Application
- Seawater RAS for fish, shrimp and marine ornamentals — the core application
- Freshwater RAS load reduction (lower efficiency, still worthwhile)
- Hatchery and holding systems that demand very clean water
- Public and marine aquaria
- Part of the complete RAS chain with drum filter, biofilter, UV and ozone
Video
Protein skimmer filter
FAQ
Frequently asked questions
How does an aquaculture protein skimmer work?
A stream of fine micro-bubbles is injected into a contact column; dissolved organics and fine solids stick to the bubble surfaces, and the resulting foam carries the waste up into a collection cup to be discarded — before it decays into ammonia.
Does a protein skimmer work better in saltwater?
Yes — foam fractionation works best in seawater RAS for fish and shrimp farms, holding systems and marine aquaria. It still helps in freshwater, at lower efficiency.
Can a protein skimmer be paired with ozone?
Yes — pairing it with an ozone generator oxidises organics and boosts both skimming efficiency and disinfection, a combination used in most integrated RAS.
What is the protein skimmer made of and how is it sized?
Bodies are corrosion-resistant PP, FRP or rotomolded LLDPE, sized by water flow (e.g. 30–60 m³/h per unit, smaller and larger on request) with venturi or pump-driven bubble generation.
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View details →Request a tailored quote
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