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Anthracite
Anthracite is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coal except for graphite. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92% and 98%. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame

Packing
Packing size 40 lite per bag

Anthracite is used in combination with sand filter in the water purification system
to purify the sediment and mud to keep the water clean. Because carbon anthracite is less than half the density of sand filter, it has Less weight than sand filter in the same amount. This is a good feature of the filter arrangement, fully increase effiency of the filter layer. Backwash rates are reduced as well. Low uniformity coefficient anthracite filter media extends the life of your filterLow uniformity coefficient anthracite typically produces consistent improvements in turbidity removal, due in part to more efficient solids loading. Plus, low uniformity coefficient media produces smaller changes in effluent turbidity during periods of peak influent turbidity. Definitely, it's better than only use sand.