MBBR Media Model: PE64Spec: $25*4mmSurface Area: > 1200m2/m3Density: 0.94~0.97 g/cm3Dosing Ratio: 15%~65%Nitrification efficiency: 500~1400gNH4 – N/m3.dMaterial: HDPEApplication : ETP, STP.Origin: China