Purwoto, S. P., and J. Sutrisno. “PENGOLAHAN AIR TANAH BERBASIS TREATMENT Ferrolite, Manganese Zeolite , Dan Ion Exchange”. WAKTU: Jurnal Teknik UNIPA, vol. 14, no. 2, July 2016, pp. 21-31, doi:10.36456/waktu.v14i2.134.