Specifications
| Media type | Crushed select anthracite coal; medium/low-density filtration media |
|---|---|
| Target contaminants | Suspended solids, floc, sediment, turbidity |
| Color | Black |
| Effective size | #1: 0.6-0.8 mm | #1½: 0.85-0.95 mm | #2: 1.7-2.0 mm |
| Uniformity coefficient | #1: <1.7 | #1½: <1.7 | #2: <1.6 |
| Mesh size | #1: 14x30 | #1½: 10x20 | #2: 4x12 |
| Specific gravity | 1.6 gm/cc (apparent) |
| Bulk density | 50 lbs/cu. ft. |
| Hardness | 3.0-3.8 (Mohs) |
| Service flow rate | 5 gpm/ft² or higher |
| Backwash rate | #1: 12-18 gpm/ft² | #1½: 18-25 gpm/ft² | #2: air scour |
| Backwash bed expansion | 20-40% of bed depth |
| Bed depth | 24-36 in (10-18 in in multi-bed filters) |
| Freeboard | 50% of bed depth (min.) |
| Standard | Meets AWWA Standard B100-01 |
Because of its lower density, anthracite hydraulically classifies above filter sand or manganese greensand to form a prefiltration layer, and its angular shape drives sediment deeper into the bed for longer runs and less head loss than equivalent sand. Backwash rates are correspondingly lower than for sand.
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