Depth filtration
Encourages solids capture through the bed (not only at the top), supporting turbidity control.
Product Water Treatment
Filter Media (Anthracite)
Anthracite filter media used as the top layer in dual- and multimedia filtration systems—supports depth filtration, higher solids loading capacity, and stable headloss behavior to maintain turbidity control. Supplied in multiple size grades to match your filter design and operating conditions.
Top-layer depth filtration
Higher solids loading
Multiple size grades
COA / sieve analysis
Packaging: bags / supersacks / bulk (as applicable)
Documentation: COA + sieve analysis / SDS on request
Lead time depends on size grade & volume
If you’re upgrading or replacing media, send your vessel dimensions, underdrain/nozzle details, target flow rate, and current media stack. We’ll recommend a practical grade and supply format for quotation.
Overview
Anthracite is a low-density, hard carbon-based filter media commonly used as the top layer in dual-media and tri-media filter beds. Its larger effective size and lighter density (relative to sand/garnet) help it remain in the upper zone during backwash, supporting stable bed stratification.
When paired with sand (and optionally garnet), anthracite improves depth filtration by allowing more solids to be captured throughout the media bed—often reducing premature surface blinding and improving run times, depending on upstream coagulation/clarification and filter hydraulics.
Higher solids loading
Often delays early headloss increase by distributing loading across the bed (system dependent).
Stable stratification
Lower density supports top-layer stability after backwash when design and backwash are correct.
Procurement-ready
Standard grades and packaging with COA / sieve analysis and SDS available on request.
Where anthracite media is typically specified
Rapid gravity filters, pressure multimedia filters, industrial process water pretreatment, and tertiary filtration—especially where depth filtration and stable headloss are important.
Applications
Common use cases where anthracite is specified as the top-layer media for depth filtration.
Dual-media filtration
Anthracite over sand to increase solids holding capacity and reduce premature surface blinding.
Often used in municipal rapid gravity filters and pressure filters.
Tri-media filtration
Anthracite + sand + garnet stacks for improved depth filtration and stratification.
Grade selection must match hydraulics and backwash capability.
Industrial process water
Pretreatment for boilers, cooling, and process units where reduced suspended solids support downstream reliability.
Share upstream coagulation and solids profile for best matching.
RO / membrane pretreatment
Media filtration upstream of cartridges/membranes to control particulate load (system dependent).
Confirm target SDI/turbidity and operating flux.
Tertiary filtration
Downstream polishing of treated effluent for reuse/discharge where consistent turbidity is required.
Backwash strategy is critical for stable long-term operation.
Upgrade / refurbishment projects
Media replacement, grade optimization, or conversion from single-media sand to dual-media beds.
We can quote full media stack supply when requested.
Typical specifications & grades
Values depend on origin and grade. Confirm exact figures and sieve distribution on quotation.
| Media type | Anthracite filtration media (washed, sized, low ash / high carbon options per lane) |
|---|---|
| Role in bed | Top layer in dual/triple media beds (above sand; above sand + garnet in tri-media) |
| Effective size (ES) | Multiple grades available (common ES ranges by design; confirm on offer) |
| Uniformity coefficient (UC) | Grade dependent; sieve analysis provided on request |
| Hardness / abrasion resistance | High hardness suitable for repeated backwash cycles (confirm on COA) |
| Ash / moisture (typ.) | Controlled by grade and supply lane; confirm on COA (important for long-term performance) |
| Cleanliness | Washed and graded; fines and dust controlled (rinsing/backwash at commissioning recommended) |
| Packaging | 25 kg bags / ~1,000 kg supersacks / bulk (as applicable) |
| Documentation | COA + sieve distribution, SDS on request (compliance requirements can be checked per sourcing lane) |
Grade selection guidance
Anthracite is typically selected as a coarser, lighter top layer above sand (and garnet if used). Grade depends on design rate, turbidity profile, coagulation/clarification performance, underdrain configuration, and available backwash/air scour. Provide your operating details and we’ll recommend a suitable grade for quotation.
Design & operation notes
Anthracite performance depends on correct bed design (layering, depth, sizing) and the backwash regime. In dual-media beds, the density and particle size are selected to maintain stratification after backwash while promoting depth filtration and stable headloss.
Layer stability
Correct size/density pairing helps keep anthracite in the top zone after backwash.
Run time & headloss
Proper design distributes solids loading and can delay premature headloss increase.
Backwash parameters
Confirm water/air scour capacity to achieve adequate bed expansion and cleaning without media loss.
-
Inspect underdrain/nozzlesVerify underdrain integrity to avoid media migration and loss.
-
Load media in correct sequenceIn dual/tri-media beds, anthracite is typically the top layer; load per design and vendor instructions.
-
Initial rinse and controlled backwashRinse until clear; perform backwash to remove fines and set the bed.
-
Validate performance targetsTrack effluent turbidity, run time, headloss, and backwash recovery during early operation.
-
Document operating windowsLock service flow, backwash, and air scour settings; record for maintenance and procurement.
Fast quantity estimate
Send vessel diameter (or bed area), desired anthracite bed depth, and number of units. We’ll estimate required tonnage and quote packaging options.