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A Comparative Study of Water Turbidity Removal Efficiency of Anthracite and Gravel in Roughing Filter. Jnl Innov. Engin. Educ. [Internet]. 2020 Mar. 31 [cited 2026 Jul. 13];3(1):42-9. Available from: https://nepjol.info/index.php/jiee/article/view/34323