... / m.2. accumulation of light weight, high strength, low energy consumption to backwash, head loss, loss of head cleaning material is only ... weight, strength, and thus low energy consumption backwash, head loss, loss of head cleaning material is only 150mm / m.3. interception ... (g/m3)2.43.37Strength(MPa)≤40Minimum compressive strength of single grain≥200Floating grain rate(%)<10Void(%)20~48Acid content ...