Anthracite

Crushed anthracite makes an excellent medium density filtration media. Because of its fractured 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.

Anthracite, because of its unique density, can be used in multi-media filters. At 56 lbs./sq. ft. it will hydraulically lassify and remain above heavier media such as filter sand or Manganese Greensand providing a prefiltration layer.

Physical Properties:
Color	Black
Density	56 lbs./cu. ft.
Sphericity	0.6
Hardness	3.0 - 3.8 (Moh's Scale)
Acid Solubility	<1%
Caustic Solubility	<1%
Apparent Specific Gravity	1.65

Physical Properties by Product:
Product	#1 Anthracite	#2 Anthracite	#3 Anthracite
Part #	A8029	A8030	A2031
Effective Size	0.6 - 0.8 mm	0.85 - 0.95 mm	1.7 - 2.0 mm
Uniformity Coefficient	1.5	1.6	1.5
Mesh Size	14 x 30	10 x 20	4 x 12
Back Wash Rate	12 - 18 gpm/sq. ft.	18 - 25 gpm/sq. ft.	use air scour
Bed Depth	24 - 36 in., 10 - 18 in. in multi-bed filters	24 - 36 in., 10 - 18 in. in multi-bed filters	24 - 36 in., 10 - 18 in. in multi-bed filters
Backwash Bed Expansion	35 - 50% obed depth	35 - 50% obed depth	35 - 50% obed depth
Service Flow Rate gpm/ft2	5 GPM/ft2 or higher	5 GPM/ft2 or higher	5 GPM/ft2 or higher