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
A self-cleaning bag filter removes fine sediment in the 1–200 µm range and automatically backwashes accumulated solids to drain when pressure rises or the timer fires. Bag life extends significantly, manual labour drops, and a single housing covers everything from coarse pre-filtration to fine polishing.
- 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 | Single bag, size #1 / #2 | SS304 / SS316 housing |
| SIGMA-BGF-2 | 20–40 m³/h | Double bag | SS304 / SS316 housing |
| SIGMA-BGF-PP | Sized per farm | Single / multi bag | PP housing |
| SIGMA-BGF-MULTI | 50 m³/h and up | Multi-bag parallel | SS316 housing |
| 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
Commercial Sand Filter
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.
View details →
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.
View details →
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.
View details →
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.
Bag Filter Request a Quote