The Banka Bio biodigester is a sustainable and maintenance-free alternative to septic tanks, made from durable fiber-reinforced plastic (FRP). It operates without energy, relying on gravity for wastewater flow and anaerobic digestion to treat blackwater efficiently. Fully installed underground, it eliminates the need for frequent desludging while preventing groundwater contamination. The system uses a specialised inoculum developed by DRDO, ensuring effective human waste breakdown.