Anthracite

    Anthracite is a select coal, mined and processed for use in water filtration. It is ideal for single bed, dual bed or multi-media filtration systems.

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    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. 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, 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.

    ADVANTAGES
    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 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
    PHYSICAL PROPERTIES
    Color: Black
    Bulk Density: 50 lbs./cu.ft.
    Hardness: 3.0-3.8 (Mohs scale)
    Effective Size:
    #1 Anthracite: 0.6-0.8 mm
    #1 ½″ Anthracite: 0.85-0.95 mm
    #2 Anthracite: 1.7-2.0 mm
    Uniformity Coefficient:
    #1 Anthracite: >1.7
    Water Soluble Ash: less than 0.5%
    Iodine #: 850 min., 900 typical
    Abrasion #: 75 min., 81 typical.
    Moisture as packed: 2% max., 0.7% typical
    Meets American Water Works Association standard B604-96
    CONDITIONS FOR OPERATION
    Water to be filtered should preferably be free of oil and suspended matter
    The water to be filtered should be relatively free of iron and turbidity for maximum service life
    Water pH range: wide range
    Bed depth: 26-30 in.
    Freeboard: 50% of bed depth (min.)
    Backwash flow rate: 10-12 gpm/sq.ft.
    Backwash bed expansion: 30-40% of bed depth
    Upon installation, backwash to remove carbon fines before placing unit into service