Crushed anthracite makes an excellent medium density filtration media. 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 hardness.
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./cu.ft, it will hydraulically classify and remain above heavier medial 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 Anthracite to be combined with other filtration media in multi-media filters.
Physical Properties
- Color - Black
- Density - 50 lbs./cu.ft
- Effective Size - #1 (0.6-0.8 mm), #1-1/2 (0.85-0.95 mm), #2 (1.7-2.0 mm)
- Uniformity
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