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Delhi's first bio-digesting toilet was installed by the Delhi Urban Arts Commission (DUAC) opposite Ram Manohar Lohia Hospital on June 30 2014. The prototype inaugurated by Urban Development Secretary Sudhir Krishna is one of four shortlisted designs. It was designed by DUAC chairman Raj Rewal. The technology used has been developed by the DRDO (Defence Research and Development Organisation). This prototype uses aluminium sandwiched honeycomb panels with stainless steel veneering for durability. The fluids discharged are treated by bacteria that convert it into water and a negligible amount of odourless non-toxic gas. This takes place in an underground chamber within a duration of three days. The water is fit for horticulture, a DUAC source explained. The unit is manufactured at Mohan Rail Components in Kapurthala, Punjab.