A water treatment device of the type which automatically regenerates itself at predetermined intervals is provided with a special disinfectant feeder device which dispenses a predetermined amount of disinfectant into the water treating media bed and the device itself to kill the bacteria therein. The...http://www.google.com/patents/US4228000?utm_source=gb-gplus-sharePatent US4228000 - Water treatment apparatus with means for automatic disinfection thereof
