... high-quality pot clay, additive pore-making agent and adhesive solvent through ball grinding, screening, molding and calcining. Ceramic filter grain ... high-quality pot clay, additive pore-making agent and adhesive solvent through ball grinding, screening, molding and calcining. It has the ... . Φ4-6, Φ16, Φ25, Φ32 Ceramic filter grain and sands for waste water treatment