Method of purifying ground water

A process for the purification of ground water in a system including a filtering medium comprising an aquifer a plurality of recharge means for injecting water into said filtering medium at a plurality of locations therein, and supply means in said filtering medium spaced from said plurality of recharge means a sufficient distance to avoid clogging of said supply means, said process comprising injecting a supply of conditioned water comprising water containing oxygen or oxygen-releasing substances into a first one of said plurality of recharge means, simultaneously withdrawing water from a second one of said plurality of recharge means adjacent to said first one of said plurality of recharge means so as to create a purification zone between said first and second ones of said plurality of recharge means, and withdrawing purified water from said supply means.