The rubber fruit shell (Havea brasiliensis) is waste product from rubber plantations that has carbon sources so can be used as material for adsorbent. This study aims to determine the effectiveness of the used rubber fruit shell adsorbent in peat water after coagulation treatment with variation of adsorbent dose (0,5; 1,0; 1,5; 2,0) g and contact time adsorption (15; 30; 60; 90) minutes. Th…