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Clack Anthracite Filtration Media

Product Description

Although its potential for water treatment has been recognized since ancient times, anthracite coal was not used for this purpose until the beginning of the 20th century. Crushed Anthracite makes an excellent medium density filtration media. Clack Anthracite is mined from the finest Pennsylvania coal. It is specifically selected for water treatment, and during its production goes through several sizing inspections. Representative samples are randomly chosen for a complete laboratory quality control analysis for effective size, uniformity coefficient, specific gravity, acid solubility and hardness. Because of its angular shape, some of the sediment penetrates deeper into the bed. When compared to equivalent filter sands, this means longer filter runs and less head loss. Backwash rates are also reduced. Because of its unique density, Clack Anthracite can be used in multi-media filters. At 50 lbs/ft³, it will hydraulically classify and remain above heavier media such as Filter Sand or Manganese Greensand, providing a prefiltration layer.

Order Information
Part No.  Description  Cu. Ft./Bag  Wt./Cu. Ft.*  Bags/Pallet  Weight/Pallet  Pallet Dimensions
A8029  Anthracite #1 (0.6-0.8 mm)  1 50 lbs.  50 2550 lbs.  40" x 48" x 56"
A8030  Anthracite #1½ (0.85-0.95 mm)  1 50 lbs.  50 2550 lbs.  40" x 48" x 56"
A8031  Anthracite #2 (1.7-2.0 mm) 1 50 lbs.  50 2550 lbs.  40" x 48" x 56"
Physical Properties
Conditions for Operation
• Color: Black • Bed depth: 24-36 in., 10-18 in multibed
• Bulk Density: 50 lbs./cu. ft. filters
• Hardness: 3.0-3.8 (Mohs scale) • Freeboard: 50% of bed depth (min.)
• Effective Size: • Service flow rate: 5 gpm/sq. ft.
     #1 Anthracite: 0.6-0.8 mm or higher depending upon local
     #1½ Anthracite: 0.85-0.95 mm conditions
     #2 Anthracite: 1.7-2.0 mm • Backwash flow rate:
• Uniformity Coefficient:      #1 Anthracite: 12-18 gpm/sq. ft.
     #1 Anthracite: <1.7      #1½ Anthracite: 18-25 gpm/sq. ft.
     #1½ Anthracite: <1.7      #2 Anthracite: use air scour
     #2 Anthracite: <1.6 • Backwash bed expansion: 20-40%
• Mesh Size: of bed depth
     #1 Anthracite: 14x30  
     #1½ Anthracite: 10x20  
     #2 Anthracite: 4x12  
• Acid Solubility: <1%  
• Caustic Solubility: <1%  
• Apparent Specific Gravity: 1.6 gm/cc  
• Meets AWWA Standard B100-01
• Higher service flows and longer filter runs than equivalent sand filters
• Close attention to gradation, hardness and purity assures consistent and reliable performance
• Unique density allows Clack Anthracite to be combined with other filtration media in multi-media filters
• Lower uniformity coefficient has less oversized and undersized particles resulting in a highly uniform bed
[custom-documents]Clack Anthracite Filtration Media [/custom-documents]
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