<![CDATA[Banyuwangi has various industries, especially the shrimp processing industry in Klatak Village. The results of the industry produce liquid waste that causes groundwater to be contaminated. Groundwater quality, especially well water, must be maintained. One of the water parameters that must be known is chloride content. This research was conducted with three adsorption treatments: adsorbent treatment variation, adsorption time variation, and adsorbent mass variation. Chloride ion levels were determined by Argentometric titration of the Mohr method. From the yield calculation, it was found that the silica content in coconut fiber was 45.5%. Coconut fiber adsorbent that is burned is able to reduce well water chloride levels more effectively (37.5% decrease) compared to acidified (25% decrease) and alkaline treatments (12.5% decrease). Coconut fiber mass of 2 grams was found to be more effective in reducing well water chloride levels compared to masses of 0.5 grams; 1 gram; 1.5 grams; and 2.5 grams. Coconut fiber adsorption time of 15 minutes is more effective in reducing well water chloride levels compared to 5 minutes, 25 minutes, 35 minutes, and 45 minutes.]]>
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