... hard and rough in surface,porous inside the structure,and have the advantages of high mechanical strength,large specific surface area ... ,a great amount of pollutant entrapment,less water head loss in the filter bed,lower consumption of back-flush water, ... %K80=1.84Uniformity coefficient%K60=1.47Hydrochloric acid soluble rate%2.83Sodium hydroxide soluble rate%1.50 Filtration materials of the ceramic ...