Complete MBBR Biofilm Carrier Media Package for Latin American Wastewater Treatment Plants Our MBBR Biofilm Carrier Media Complete Package (Model BM-MBBR-CP) is a turnkey MBBR media solution that bundles K1 (12×9mm) and K5 (25×12mm) HDPE biofilm carriers into a single, pre-engineered package for wastewater treatment plants across Latin America . Each package includes detailed process calculations, stainless steel retention screens, aeration optimization guidelines, and