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. It is specifically selected for water treatment and during its production goes through several sizing inspections. Samples are randomly chosen for a complete laboratory quality control analysis for effective size uniformity, specific gravity, acid solubility and hardness. Because of its unique density, Anthracite can be used in multi-media filters, providing a prefiltration layer.

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