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The authors have investigated the filtering effects to bacteria and E. coli and the elution/adsorption for minerals, residual chlorine, COD, and organochlorine compounds by using granite porphyry, Bakuhanseki. The filtering effects of Bakuhanseki to bacteria were appeared, particularly the reduction rates of E. coli were 24.5 ± 8.32 and 84.4 ± 1.50% for Taihei river water samples and more than 50%...