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.