Anthracite is a select coal, mined and processed for use in water filtration.

Anthracite

DESCRIPTION
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.

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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.

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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
# 1.5 Anthracite: 0.85-0.95 mm
#2 Anthracite: 1.7-2.0 mm
Uniformity Coefficienty:
#1 Anthracite: <1.7
# 1.5 Anthracite: <1.7
#2 Anthracite: <1.6
Mesh Size:
#1 Anthracite: 14x30
#1.5 Anthracite: 10x20
#2 Anthracite: 4x12
Acid Solubility: =or<1%
Caustic Solubility: <1%
Apparent Specific Gravity: 1.6 gm/cc
Meets AWWA Standard B100-96

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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.
#1.5 Anthracite: 18-25 gpm/sq. ft.
#2 Anthracite: use air scour
Backwash bed expansion: 20-40% of bed depth

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FLOW RATE
Service Flow Pressure Drop and Backwash Bed Expansion charts to be added later. Check back for updates.

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ORDER INFORMATION

Part No.

Description

Cu.Ft./Bag

Wt./Cu.Ft.*

Bags/
Pallet

Weight/
Pallet

Pallet Dim.

A8029  

Anthracite #1
(0.6-0.8 mm)

1

50 lbs.

40

2050 lbs. 

41"x46"x45" 

A8030

Anthracite #1 1/2
(0.85-0.95 mm)

1

50 lbs.

40

2050 lbs.

41"x46"x45"

A8031

Anthracite #2
(1.7-2.0 mm)

1

50 lbs.

40

2050 lbs.

41"x46"x45"

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STANDARDS
Tested and listed under ANSI/NSF Standard 61 for Health Effects.

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