... surface, porous inside the structure, and have theadvantages of high mechanical strength, large specific surface area and porosity ... treatment, they behave a activated surface property, a great amount of pollutant entrapment,less water head loss in ... ,upgrade the water quality, and savechemicals and energy.Physical Property ItemReddish-brown; Globosity; PorosityUnitIndexPore Diameter0.15-39Real Densityg ...