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We investigated if in-­situ metal bioprecipitation (ISMP) is applicable to remediate a highly permeable zinc-contaminated aquifer at a metal-­processing factory in Maasmechelen, Belgium. A large (more than 200 m long and 70 m wide) groundwater contamination plume has developed, with zinc concentrations in the range of 1 -­ 100 mg/L, whereas the legal Flemish clean-­up standard is 0.5 mg/L.