... power and constructional expenses;2. Uniform and regular in particle size, make it easy to be cleaned, the back-flush ... 3. Technical Indexes of Ceramic Sand Filters ItemIndex Remark Particle size,mm0.5-3.0- Bulk density, g/ml1.1 ... ,t/m2.h2-4- Gas permeability,m3/m2h.h1500-2000- Thermal resistance,≥1000- Acid resistance,99.5Mixed in 30 ... +10% KOH solution for 14 days 4. Product Size(mm):Φ0.5-1,Φ1-2,Φ2-3,Φ5- ...