Abstract: A system and method removes soluble iron from potable water by oxidation. It includes a pressure tank, an oxygen induction device and a filtration tank. Untreated water flows under pressure into the pressure tank, where the water is held for delivery to service. Upon demand, the untreated water leaves the pressure tank and flows into the oxygen induction device. The oxygen induction device mixes air with the untreated water using a venturi apparatus. This aeration causes an oxidation reaction to occur so that the soluble iron in the untreated water transforms into insoluble iron and precipitates. The aerated water then flows into a filtration tank where the oxidized iron precipitates are filtered out by a filtration media mix. Purified water is provided to service by the filtration tank. Backwashing of the filtration media is also provided to rejuvenate the media for prolonged use.

Abstract: An improved unit for removal of tannin and lignin from water is disclosed, which features a cylindrical tank containing a tannin/lignin-adsorbing resin bed and a distributor tube/water distributor assembly. The assembly comprises a distributor tube extending from an orifice in the upper portion of the tank to a lower distributor assembly, and a riser tube having an open end disposed near the lower distributor assembly and communicating with an upper distributor located beneath the surface of the resin. A water flow restrictor is provided in the lower distributor assembly, such that when water is passed downwardly through the distributor tube in a backwash mode, some of the water is injected into the riser tube. This causes the backwash water to flow into the resin bed at its lower portion and to carry resin up through the riser tube to the upper portion of the resin bed.

Abstract: An improved water neutralization apparatus is disclosed comprising an elongated vertical cylindrical tank having an upper inlet and lower outlet openings. Water distributors are assembled to the tank at its upper and lower openings. A dual-seal valve is used to automatically shift water flow from normal to backflush flow paths upon actuation of a controller, comprising a timer-operated valve in a drain line connected to the dual-stem valve. In the preferred embodiment, the neutralizing mineral is 98% pure calcium carbonate.

Abstract: An improved unit for removal of nitrates from water is disclosed, which features a cylindrical tank containing a nitrate-adsorbing resin bed and a dip tube/water distributor assembly. The assembly comprises a dip tube extending from an orifice in the upper portion of the tank to a lower distributor assembly, and an additional backflush tube having an open end disposed near the lower distributor assembly and communicating with an upper distributor located beneath the surface of the resin. A water flow restrictor is provided in the lower distributor assembly, such that when water is passed downwardly through the dip tube in a backflush mode, some of the water is squirted into the additional backflush tube, so that the backflush water flows into the resin bed at both its lower and upper portions. In this way, the resin bed is more effectively regenerated by subsequent supply of a brine solution than if the rinse water were only injected at the lower portion of the resin bed.