Otenyo Makonjio Philip, Masibayi Namusasi Edward, K’Owino Owino Isaac and China Simiyu Samuel 2023. Efficiency of Pumice-Sand Granular Filter in Removing Effluent Wastes in Shirere Wastewater Treatment Plant in Kakamega County, Kenya. American Scientific Research Journal for Engineering, Technology, and Sciences. 96, 1 (Oct. 2023), 1–28.