... filter grain and sand 1,high-quality pot clay 2,additive pore-making agent 3,adhesive solvent through ball grinding Ceramic filter ... grain and sand1,high-quality pot clay2,additive pore-making agent 3,adhesive solvent through ball grinding Ceramic filter ... sand is produced from high-quality pot clay, additive pore-making agent and adhesive solvent through ball grinding, screening, molding ...