Otenyo Makonjio Philip, Masibayi Namusasi Edward, K’Owino Owino Isaac, and China Simiyu Samuel, “Efficiency of Pumice-Sand Granular Filter in Removing Effluent Wastes in Shirere Wastewater Treatment Plant in Kakamega County, Kenya”, ASRJETS-Journal, vol. 96, no. 1, pp. 1–28, Oct. 2023.