Efficiency of Indonesian Degradation Products in Treating Septic Tank Faecal Sludge Widhowati Kesoema Wardhani, Harmin Sulistiyaning Titah, Mas Agus Mardyanto and Eddy Setiadi Soedjono E3S Web Conf., 557 (2024) 02007 Published online: 15 August 2024 DOI: 10.1051/e3sconf/202455702007