Upon well recharge of aerobic water into an anaerobic aquifer a number of redox and dissolution reactions occur. In these redox reactions sulfides and organic material are oxidized by oxygen and nitrate present in the recharge water. Acid, produced during these redox reactions, is neutralized by calcium carbonate present in the aquifer and by the hydrogen carbonate‐carbon dioxide equilibrium. Sulfides, organic material, and calcium carbonate are present in finite quantities in the aquifer. Therefore these processes will terminate after some time, and an aerobic zone will spread around the recharge well. These geohydrochemical reactions have major consequences for a system consisting of separate recharge and discharge wells with respect to the clogging of the discharge wells and to the treatment of the abstracted water to drinking wate