Bio Media MBBR HDPE Biofilm Carrier for Biological Aerated Filter Bio Media | MBBR HDPE Biofilm Carrier for BAF WWTP & ETP Product Overview This bio media is a virgin HDPE MBBR biofilm carrier filter media suitable for biological aerated filter (BAF) and MBBR processes in WWTP and ETP plants. With 800 m²/m³ specific surface area and over 95% void ratio, it provides a high-performance biofilm support for BOD5, COD and ammonia removal in plants across Latin America, South