Peninjauan Ipal Limbah Ptinsan Sandang Internusa. Toxic waste sludge mixed with coal inside the Waste Water Management Installation (IPAL) PT. Insan Sandang Internusa during the field trial of the law suit on wastewater discharge permit that was released by Sumedang Regency to PT Kahatex, PT Five Star and Insan Sandang Internusa in Sumedang, West Java. The three companies allegedly were discharging their waste to farm areas surrounding the neighbourhood for almost 20 years.