NKWONTA, Onyeka; OLUFAYO, Olufisayo; OCHIENG, George; ADEYEMO, Josiah; OTIENO, Fred. Turbidity removal: Gravel and charcoal as roughing filtration media. South African Journal of Science, [S. l.], v. 106, n. 11/12, p. 5 pages, 2010. Disponível em: https://sajs.co.za/article/view/10100. Acesso em: 5 may. 2024.