... electric power and constructional expenses;2. Uniform and regular in particle size, make it easy to be cleaned, the back-flush strength ... component 3. Technical Indexes of Ceramic Sand Filters ItemIndex Remark Particle size,mm0.5-3.0- Bulk density, g/ml1.1-1 ... 10% NaOH+10% KOH solution for 14 days 4. Product Size(mm):Φ0.5-1,Φ1-2,Φ2-3,Φ5-6 ...