It is migrating slowly through the subsoil
For instance, chlorine when exposed to the sunlight will dissipate. Would that happen to chloride? the difference between the two substances is an extra electron. Could you pump up water from the aquafer into a shallow pool and allow the chloride to evaporate and then reintroduce it to the aquafer?
Erwin Decoene wrote:Chemical treatment is possible but is usually expensive.