Abstract: A water filtration system having a tank, a fluid flow interface into the interior of the tank, and a control valve. The control valve is in fluid communication with the fluid flow interface. The control valve includes a source water inlet for receiving a flow of source water, a drain outlet, a treated water outlet and an air inlet, the control valve being operable to control a passage of fluids between the inlets and the outlets and the fluid flow interface. A filtration media is contained within the tank which includes a media mixture of manganese dioxide coated silica core filtration media and iron hydroxide filtration media. The control valve may be programmed to perform a filtering service process, a backwashing process and an air downflow process.