... water production cycle, typically 500-1000m / m.2. accumulation of light weight, high strength, low energy consumption to backwash, head ... , 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 ratio(%)≤ ...