The chlorination basin, 90 feet by 53 feet, is baffled to provide a serpentine flow path for the water. Effluent from the carbon columns flows to the chlorine contact basin for chlorination to oxidize residual ammonia, and to destroy remaining bacteria and virus. Chlorine is added through a diffuser in the pipeline, just upstream of the entrance to the contact basin. Effluent from the chlorination basin flows by gravity to the blending and storage reservoir where it mixes with RO product water and deep well water.

Currently, injection water for the Talbert Barrier is a blend of 62 percent reclaimed wastewater and 38 percent groundwater pumped from a deep aquifer zone that is not subject to seawater intrusion. OCWD has applied for and received a permit to modify the treatment process to allow for injection of 100 percent reclaimed water, eliminating the use of deep well water for blending.

The treatment plant's efficiency in reducing COD, TOC, nitrogen, and turbidity is demonstrated by the water quality data. A higher proportion of RO product water will reduce TOC below levels found in most drinking water supplies. And the high quality water from deep wells which is currently used for blending will be treated to remove color; it holds great promise as a potable water source.