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Clack® 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.
Anthracite
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.
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 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
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
#1½ Anthracite: 0.85-0.95 mm
#2 Anthracite: 1.7-2.0 mm
Uniformity Coefficienty:
#1 Anthracite: <1.7
#1½ Anthracite: <1.7
#2 Anthracite: <1.6
Mesh Size:
#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 B100-96
CONDITIONS FOR OPERATION
Bed depth: 24-36 in., 10-18 in multi-bed filters
Freeboard: 50% of bed depth (min.)
Service flow rate: 5 gpm/sq. ft. or higher depending upon local conditions
Backwash flow rate:
#1 Anthracite: 12-18 gpm/sq. ft.
#1½ Anthracite: 18-25 gpm/sq. ft.
#2 Anthracite: use air scour
Backwash bed expansion: 20-40% of bed depth |
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Tested and
listed under ANSI/NSF Standard 61 for Health Effects. |
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The information and recommendations in this publication are based on data
we believe to be reliable. They are offered in good faith, but do not imply any warranty
or performance guarantee, as conditions
and methods of use of our products are beyond our control. As such, Clack makes no express
or implied warranties of any kind with respect to this product, including but not limited
to any implied
warranty of merchantability or fitness for a particular purpose. We recommend that the
user determine whether the products and the information given are appropriate, and the
suitability and performance of our products are appropriate, by testing with its own
equipment.
The information and recommendations given in this publication should not be understood as
recommending the use of our products in violation of any patent or as a license to use any
patents of the Clack Corporation.
The filter medias listed in this brochure do not remove or kill bacteria. Do not use with
water that is microbiologically unsafe or of unknown quality without adequate disinfection
before or after the
system.
Clack will not be liable under any circumstance for consequential or incidental damages,
including but not limited to, lost profits resulting from the use of our products.
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R&M Manufacturing,
Inc.
