Low uniformity coefficient anthracite typically produces consistent improvements in turbidity removal, due in part to more efficient solids loading. Plus, low uniformity coefficient media produces smaller changes in effluent turbidity during periods of peak influent turbidity.

Our anthracite filter media is produced from the highest quality anthracite available to ensure the physical characteristics of hardness, durability and performance.

 All of our Anthracite products meet or exceed AWWI B100-01 (latest edition) and NSF ANSI Standard 61.


  • Higher service flows and longer filter runs than equivalent filters
  • Unique density allows Anthracite to be combined with other filtration media in multi-media filters
  • Close attention to gradation, hardness and purity assures consistent and reliable performance
  • Lower uniformity coefficient has less oversized and undersized particles resulting in a highly uniformed bed

Physical Characteristics

  • Color: black
  • Bulk Density: 50 lbs./cu. ft.
  • Specific Gravity: 1.6 + .05
  • Effective Size: .60 – 2.30 mm
  • Uniformity Coefficienty: 1.3 – 1.7
  • Hardness: 3.0 – 3.8 (Mohs scale)

Operational Specifications

  • Bed depth: 24 – 36 in., 10 – 18 in. for multibed filters
  • Freeboard: 50% of bed dept (min.)
  • Service flow rate: 5 gpm/sq. ft. or higher depending upon local conditions
  • Backwash flow rate: 12 – 25 gpm/sq. ft. depending upon mesh size
  • Backwash expansion rate: 20 – 40% of bed depth