Anthracite is a natural mineral used as a top layer filtration mineral in multimedia sand filters. Because the anthracite specific weight is lower than quartz sand, it can remain in the top layer after backwashing of the sand filter. The anthracite, particle size is in the range of 0.8 - 1.6 mm and the media is spread on the filters at a thickness of about 30 cm. For media filters that do not use anthracite, the backwash wastewater discharge can be much more. For this reason, anthracite should be used in multimedia sand filter design.
Do not leave missing or free space