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Production of Clay-Based Water Filter Using Biomass of Bacillus Subtillis, Sawdust, Activated Charcoal, Periwinkle and Snail Shell as Additives. Afr. Sci. Rep. [Internet]. 2023 Jun. 18 [cited 2024 Dec. 2];2(2):93. Available from: https://asr.nsps.org.ng/index.php/asr/article/view/93