... for the excess load active sludge law transformation and the area limited newly built sewage factory. Mbbr Packings available material: ... of unites per m3666,3401038,0001038,700341,000135,300Specific surface area(m2/m3)>693>845>834>591>427ColorNatural WhiteMaterialVirgin polythene ... 70% filling ratio480 m²/m³Effective growing area of each one490 m²/m²Effective area of 70% filling ratio350 m²/m³ ...