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Fig. 1. Flow rates for various leaching experiments for (a) Column A and (b) Column B. (•) -100 mm Br step-up, continuous; ({circ}) -20 mm Br step-down, continuous; ({blacksquare}) -20 mm Cl step-up, continuous; ({square}) -20 mm Cl step-down, intermittent; ({blacktriangleup}) -20 mm Br step-up, intermittent. The term I is drainage.