Anthracite

Although its potential for water treatment has been recognized since ancient times, anthracite coal was not used for that purpose until the beginning of this century. Crushed anthracite makes an excellent medium density filtration media. Anthracite has been manufactured from the finest Pennsylvania coal since 1932. It is specifically selected for water treatment, and during its production goes through several sizing inspections. Random samples are chosen for a complete laboratory quality control analysis for effective size, uniformity coefficient, specific gravity acid solubility and hardness. Because of its fractured shape, some 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. Anthracite, because of its unique density, can be used in multi-media filters. At 56 lbs./ft.3 it will hydraulically classify and remain above heavier medial such as Filter Sand or Manganese Greensand providing a pre-filtration layer. Advantages: � Higher service fl ows and longer fi lter runs than equivalent sand fi lters. � Close attention to gradation, hardness and purity assures con sis tent and reliable performance. � Unique density allows Anthracite to be combined with other fi ltration media in multi-media filters.

Physical Properties: Color Black Density 50 lbs./cu. ft.3 Effective Size #1-1/2 (0.85-0.95 mm) Uniformity Coeffi cient #1-1/2 (1.6) Mesh Size - #1-1/2 (10 x 20) Sphericity 0.6 Hardness 3.0-3.8 (Mohˇ¦s Scale) Acid Solubility <1% Caustic Solubility 0<1% Apparent Specifi c Gravity 1.65 Meets American Water Works Association Standard - B100-89 Conditions for Operation: Color Black Bed Depth 24 - 36 in. Backwash Rate - #1-1/2 (18-25 gpm/ft.2) Backwash Bed Expansion 30-50% of bed depth Service Flow Rate 5 gpm/sq. ft. or higher depending upon local conditions