Phosphorus is the primary cause of algae blooms, the resulting eutrophication, and the consequential death of many fresh water ponds, lakes and rivers. Hence, many municipal and industrial wastewater treatment facilities are facing new more stringent permit limits for phosphorus, with values of 0.2 to 0.05 mg/L being proposed in many watersheds and even 0.01 mg/L in some. Many of these plants are actively seeking a tertiary treatment process that fits within a small footprint and a limited budget while providing flexibility to meet both current and future limits. CoMag™ is particularly effective in removing Phosphorus as it can be chemically precipitated with various metal salts. Moreover, a CoMag™ system can be configured and tuned chemically to deliver cost effective Phosphorus removal at whatever permit limit level is prescribed in a plant’s operating permit. Recent Phosphorus Removal Performance at a 6.0 MGD Municipal WWTP In upset conditions, CoMag™ has even demonstrated its ability to reduce influent Phosphorus from 57 mg/L to 0.1 mg/L. While operating under conditions to give a nominal effluent P of less than 0.1 mg/L, a septage overload at the Concord plant resulted in a CoMag™ influent that was essentially raw sewage: black with heavy solids and having a phosphorus content of 51 mg/L. CoMag™ provided a clean effluent, showed no signs of fouling, and cleaned itself of any remnant of the event within an hour following return to the normal (secondary effluent) feed.