Bio Media HDPE MBBR Biofilm Carrier for Nitrogen Removal Bio Media | HDPE MBBR Biofilm Carrier for ETP & WWTP Nitrogen Removal Product Overview This bio media is a virgin HDPE MBBR biofilm carrier engineered for nitrogen removal in ETP and WWTP plants, with a specific surface area of 800 m²/m³ and a pre-colonized surface option for faster startup. It supports stable nitrification and denitrification for municipal and industrial effluent in Latin America, South America and