TABLE 8.2 Typical Properties of Common Filter Media for Granular-Bed Filters(Cleasby and Fan, 1981; Dharmarajah and Cleasby, 1986; Cleasby and Woods, 1975) Granular Silica Anthracite activated sand coal carbon Garnet ILmenite Grain density, Ps Kg/m' 2650 1450-17301300-1500*3600420042004600 oose- bed porosity∈d 0.42-0.470.560.600.50 0.45-0.55 Sphericity y 0.7-0.8 0.460.600.75 0.60 For virgin carbon, pores filled with water, density increase when organics are adsorbed w Not available