Clack Anthracite Filter Media Ideal for Multi-Media Filters

Clack anthracite filter media

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.

Key features

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

Specification

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 Coefficient:
#1 Anthracite: <1.7
#1½ Anthracite: <1.7
#2 Anthracite: <1.6
• Mesh Size:
#1 Anthracite: 14×30
#1½ Anthracite: 10×20
#2 Anthracite: 4×12
• Acid Solubility: <1%
• Caustic Solubility: <1%
• Apparent Specific Gravity: 1.6 gm/cc
• Meets AWWA Standard B100-01
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