Fine deep-bed filtration, ~10–20 µm
Polishes the water after drum or screen filtration, protecting downstream UV, biofilter and pumps.
Commercial Sand Filter
Deep-bed mechanical polishing for clear water — a commercial high-rate sand filter for aquaculture that traps fine suspended solids down to ~10–20 µm in a graded sand bed, with simple multiport backwash, corrosion-resistant FRP or stainless housing, and flow rates from small RAS loops to large commercial farms.
- Capacity5–100+ m³/h
- Precision~10–20 µm deep-bed
- TankFRP / SS304 / SS316
- LayoutVertical or horizontal
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
Fiberglass Sand Filters are designed to be installed on large commercial installations such as Olympic size pools, diving pools, and water parks. The standard production incorporates a large access manhole in the top for ease of access to the interior. Inside the filter all internal parts and pipework are upgraded to the highest commercial standard, ensuring long life and minimal servicing. As with all other DAVEY filters, the D series is manufactured from totally noncorrosive materials making it an excellent choice for various long-term applications and installations.
Advantage:
- 100% factory test according to NSF50 standard and MINDER standard
- The air relief bolt enables easy release of trapped air during the operation of the filter
- A large access manhole in the top for ease of access to the interior
- Designed to assemble with Butterfly valve
- Influent manifold distribution to prevent clogging
- 2×3” Oil Pressure Gauge included
- The materials used are dependable and are suitable for all-weather performance
- UV resistance surface allows the filter to work under direct sunlight
- Sand Required: 0.8-1.0 mm
- 5-10 years lifetime
Video of Product
Application
Package and Shipment
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-CSF-500 | 5–8 m³/h | ||
| SIGMA-CSF-700 | 10–15 m³/h | ||
| SIGMA-CSF-900 | 18–25 m³/h | ||
| SIGMA-CSF-1200 | 30–45 m³/h | ||
| SIGMA-CSF-1600 | 50–80 m³/h | ||
| SIGMA-CSF-2000+ | 100 m³/h and up |
| Filter bed | Graded quartz sand; optional glass media / anthracite / multi-media beds |
|---|---|
| Filtration precision | Approx. 10–20 µm deep-bed filtration — far finer than a screen or drum filter |
| Cleaning | Multiport / backwash valve, pressure-differential triggered — no media replacement |
| Tank material | FRP (fiberglass) / SS304 / SS316 (316L for saltwater) |
| Water feed | Pressurized pump feed |
| Water type | Freshwater / saltwater (also used in pools and public aquaria) |
| Options | Multi-media grading, automatic backwash valve, pressure gauge / sight glass, enlarged capacity |
System composition
Backwash, never replace the sand
A simple multiport valve reverses the flow to flush trapped dirt to drain — low running cost.
Corrosion-resistant tanks
FRP or 316L stainless construction suits both fresh and salt water.
Vertical or horizontal layout
Configured to the site and the required flow.
Multi-media options
Quartz sand graded with glass media or anthracite improves dirt-holding and throughput.
Proven across industries
The same high-rate sand filter design serves aquaculture, public aquaria and commercial pools — a mature supply chain.
Application
- Mechanical polishing stage in RAS — after drum/screen filtration, before UV and biological treatment
- Sea- and freshwater farm pre-treatment and intake-water polishing
- Public aquaria and large ornamental display tanks
- Commercial swimming pools and spas
Video
Commercial Sand Filter
FAQ
Frequently asked questions
What does an aquaculture sand filter remove?
It is a deep-bed polishing stage that captures fine suspended solids (typically down to ~10–20 µm) after coarse solids are removed by a drum or screen filter, keeping the water clear and protecting downstream UV, biofilter and pumps.
How is a sand filter cleaned?
When the bed loads up and pressure rises, a simple multiport / backwash valve reverses the flow to flush trapped dirt to drain — no media replacement, just periodic backwash.
What is the sand filter housing made of?
The tank is corrosion-resistant FRP (fiberglass) or stainless steel for fresh- and sea-water duty, in horizontal or vertical layouts to suit the site.
Can one sand filter use different media?
Yes — it runs on graded quartz sand and can take optional glass or anthracite for multi-media grading to improve solids capture and flow.
Related equipment
Related equipment
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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.
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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.
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.
Commercial Sand Filter Request a Quote