The raw unprocessed bentonite clay was observed to increase the pH of the F− solution as opposed to the Fe3+-modified bentonite. Groundwater accounts for 98 percent of the earth's potable water. The adsorption data fitted well to Langmuir adsorption model indicating a monolayer coverage of the adsorbent. All adsorbents used are inexpensive and nontoxic materials, available easily in nature and locally at village/rural level. This is crucial for the application of this adsorbent, since defluoridation can be carried out at the normal pH of the groundwater with no adjustment unlike most other adsorbents. The adsorption data fitted well to Langmuir adsorption model indicating a monolayer coverage of the adsorbent. Defluoridation in the presence of high calcium levels in potable groundwater is paramount, as the consumption of groundwater enriched with fluoride, and calcium has been implicated in causing chronic kidney disease of unknown etiology (CKDu) in Sri Lanka. 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DEFLUORIDATION; Defluoridation may be underaken for naturally occuring fluoride in ground water by municipalities. Defluoridation of Groundwater Using Termite Mound Defluoridation of Groundwater Using Termite Mound Fufa, Fekadu; Alemayehu, Esayas; Lennartz, Bernd 2013-04-17 00:00:00 Water Air Soil Pollut (2013) 224:1552 DOI 10.1007/s11270-013-1552-y Fekadu Fufa & Esayas Alemayehu & Bernd Lennartz Received: 12 January 2013 /Accepted: 28 March 2013 /Published online: 17 April 2013 … Defluoridation by Natural Method in the Groundwater of Tiruchengode Taluk, Namakkal District - written by A. Arun Kumar, S. M. Mazhar Nazeeb Khan published on 2018/04/24 download full article with reference data and citations Register to receive personalised research and resources by email, Environmental Remediation and Water Pollution Chemistry Research Group, Department of Ecology and Resources Management, University of Venda, Private bag X5050, Thohoyandou, 0950 Limpopo, South Africa, Tel. 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