An apparatus for the continuous treating of a water well with chlorine or hydrogen peroxide includes an inlet pipe, which is mounted in the cover on a water well and an elongated tube extending downwardly from the bottom end of the pipe into the well, preferably beyond any pitless adaptor, for depositing chlorine pellets or chlorine or hydrogen peroxide solution in the well. The pellets or solution are added roughly on a weekly basis which prevents a chlorine or hydrogen peroxide smell in the water.