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Batching It by Kate O'Brien Builders and developers of small communities not serviced by municipal sewerage systems can provide efficient and pollution-free wastewater treatment for a reasonable cost, with this batch wastewatertreatment system. Chromaglass systems are available in seven standard sizes, from 500 to 12,000 treated gallons per day. How it works: Free oxygen is introduced, and aerobic microorganisms clean and clear wastewater of 85 to 95 percent of its suspended solids. Batch treatment, much like the process used in municipal waste-treatment centers, is used. The treatment cycles are timecontrolled and a preset volume of treated effluent is pressure-discharged, allowing for peak surges and requiring less retention time. As a result, drain fields do not get clogged, or polluted. The system is accepted by