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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
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.
ƒÜ Higher service fl ows and longer fi lter runs than
equivalent sand fi lters.
ƒÜ Close attention to gradation, hardness and purity assures
con sis tent and reliable performance.
ƒÜ Unique density allows Anthracite to be combined
with other fi ltration media in multi-media filters.
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)
Hardness 3.0-3.8 (Moh¡¦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:
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