Self-cleaning, fewer bag changes
Automatic backwash and sludge discharge on differential pressure or timer extends bag life and keeps the line running unattended.
Bag Filter
Fine sediment removal that flushes itself — a self-cleaning bag filter that polishes water by trapping fine sediment and suspended solids inside a selectable 1–200 µm filter bag, then automatically backwashes the accumulated solids to drain on a differential-pressure or timer trigger, so it runs far longer between bag changes and cuts manual labour.
- Micron rating1–200 µm selectable
- Capacity5–50+ m³/h
- HousingSS304 / SS316 / PP
- CleaningAutomatic backwash / discharge
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
bag filter housing was made of polypropylene material. Feature in strong corrosion resistance, applicable to long time strong corrosive liquid filtration.
- Double open at the bottom, convenient for installation.
- Easy handle design, no need for any tools to open and close filter house, very convenient to replace filter bag.
- Carefully sealing designed, 100% without any leakage.
Advantage:
Aquaculture incubation system
Water Treatment
Chemical Industry
Automobile industry
Pharm Industry
Coating Industry
Specifications
Models & configuration
Model series integrated from industry practice — final specifications are confirmed by SIGMA's production line per project.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-BGF-1 | 5–20 m³/h | ||
| SIGMA-BGF-2 | 20–40 m³/h | ||
| SIGMA-BGF-PP | Sized per farm | ||
| SIGMA-BGF-MULTI | 50 m³/h and up |
| Bag micron rating | 1 / 5 / 25 / 50 / 100 / 200 µm — change the bag to change the precision |
|---|---|
| Bag material | PP / PE non-woven / nylon mesh (washable-reusable option) |
| Housing | SS304 / SS316 (316L for saltwater) / PP |
| Water feed | Pressurized pump feed |
| Self-cleaning | Differential-pressure or timer triggered automatic backwash and sludge discharge — far longer bag life, less labour |
| Water type | Freshwater / saltwater |
| Options | Multi-bag parallel housings, quick-open lid, pressure gauge / air vent, PLC-controlled backwash |
System composition
Selectable precision, 1–200 µm
One housing covers coarse pre-filtration to fine polishing — just change the bag.
Low-cost entry to fine filtration
An economical choice for side-stream or point-of-use polishing where a full drum or sand filter would be overkill.
Corrosion-resistant housing
316L stainless or PP bodies suit fresh and salt water.
Compact footprint
Drops onto a makeup-water line, ahead of a UV sterilizer, or onto a single tank.
Standard consumables
Industry-standard #1/#2 bag sizes are easy to source worldwide; replacing a bag takes minutes.
Application
- Side-stream and point-of-use polishing in RAS — makeup-water lines, ahead of UV, single-tank clean-up
- Sea- and freshwater intake fine filtration
- High-purity water polishing for hatcheries and nurseries
- Koi-pond and aquarium polishing alongside sand or drum filtration
FAQ
Frequently asked questions
What does a bag filter remove?
It polishes water by trapping fine sediment and suspended solids inside a filter bag, with a selectable micron rating typically 1–200 µm.
How does the self-cleaning bag filter reduce labour?
An automatic backwash / sludge-discharge cycle, triggered by differential pressure or a timer, flushes the trapped solids to drain so the unit keeps running and bags last much longer between swaps.
Where is a bag filter used in a RAS?
It is ideal as a point-of-use polishing or side-stream filter — on a makeup-water line, ahead of a UV sterilizer, or to clear up a specific tank — where a full drum or sand filter would be overkill.
Can one bag filter handle different fineness?
Yes — the bag micron rating is selectable (typically 1–200 µm), so the same housing can do coarse pre-filtration or fine polishing simply by changing the bag.
Related equipment
Related equipment
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High-flow commercial sand filters for aquaculture, RAS & pond water treatment — efficient solids removal, easy backwash. Multiple sizes, factory-direct from SIGMA. Get a quote.
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Screen Filter
Motorized self-cleaning screen filters for aquaculture & RAS — automatic backwash, fine mesh, low maintenance. Multiple sizes, factory-direct from SIGMA. Request specs & pricing.
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UV Filter
UV sterilizers for aquaculture & RAS — kill bacteria, parasites & algae spores, prevent disease without chemicals. Multiple flow rates, factory-direct from SIGMA. Get a quote.
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Automatic Rotary Drum Filter
Self-cleaning rotary drum filters for RAS & aquaculture — automatic solids removal, multiple flow rates & micron options. Factory-direct from SIGMA. Request sizing & pricing.
View details →Request a tailored quote
Tell us your species, target density and site — our engineers size the system and reply within one business day.
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