Ahmad J, Umar M, karim S, amaduddin M, Akhtar K, Shah F. Effect of coagulation flocculation and sand & gravel filtration on the quality of car wash waste water. JPIChE [Internet]. 2018 Dec. 30 [cited 2024 Apr. 25];45(2). Available from: http://piche.org.pk/journal/index.php/jpiche/article/view/370