Containerized MBBR Bio Media Treatment Unit for Remote Communities in Brazil and Colombia Our Containerized MBBR Bio Media Treatment Unit (Model BM-CTU20) is a fully integrated bio media wastewater treatment plant pre-assembled inside a standard 20ft ISO container. Designed for decentralized sanitation in remote communities across Brazil and Colombia , this plug-and-play system combines fine screening, flow equalization, MBBR biological treatment with HDPE biofilm carriers,