The coarse top layer of a dual-media bed
Filter Anthracite
Low-ash, high-carbon anthracite graded for dual and multimedia filters. Its lower density lets it sit above silica sand after backwash, giving depth filtration and longer runs between washes.
- Manufactured to: EN 12909
- Manufactured to: AWWA B100
Overview
In a single-media sand filter, most solids are captured in the top few centimetres and head loss climbs quickly. Adding a coarser, lighter anthracite layer above the sand converts the bed to depth filtration: larger floc is caught in the anthracite, finer particles in the sand below. In practice this typically extends filter runs by 50–100% at the same influent quality.
Grading matters as much as the material. Anthracite that is too fine will intermix with the sand; too coarse and it passes floc straight through. We supply it matched to your existing sand gradation so the two layers stratify cleanly after every backwash.
Packing options
- Woven polypropylene bag25 kg
- Jumbo bag (FIBC)500 kg / 750 kg
Available gradations
Filter Anthracite
| Size | Effective size | Uniformity coefficient | Typical use |
|---|---|---|---|
| 0.8 – 1.6 mm | 0.9 mm | ≤ 1.5 | Dual-media potable water filters |
| 1.2 – 2.5 mm | 1.3 mm | ≤ 1.5 | High-rate and industrial filters |
- Size
- 0.8 – 1.6 mm
- Effective size
- 0.9 mm
- Uniformity coefficient
- ≤ 1.5
- Typical use
- Dual-media potable water filters
- Size
- 1.2 – 2.5 mm
- Effective size
- 1.3 mm
- Uniformity coefficient
- ≤ 1.5
- Typical use
- High-rate and industrial filters
Other cuts can be produced to specification — send us the effective size and uniformity coefficient you need.
Technical specification
| Property | Typical value | Test method |
|---|---|---|
| Fixed carbon | ≥ 90% | — |
| Ash content | ≤ 5% | — |
| Specific gravity | 1.4 – 1.6 g/cm³ | — |
| Hardness | ≥ 3 Mohs | — |
| Acid solubility | ≤ 3% | — |
- Property
- Fixed carbon
- Typical value
- ≥ 90%
- Test method
- —
- Property
- Ash content
- Typical value
- ≤ 5%
- Test method
- —
- Property
- Specific gravity
- Typical value
- 1.4 – 1.6 g/cm³
- Test method
- —
- Property
- Hardness
- Typical value
- ≥ 3 Mohs
- Test method
- —
- Property
- Acid solubility
- Typical value
- ≤ 3%
- Test method
- —
Typical values. The certificate issued with your shipment reports the figures measured on that production lot.
Where it is used
Need this grade?
Send the gradation, the volume and the destination port. Our technical team responds within one working day with pricing, lead time and a specimen certificate of analysis.