The Modulair package wastewater treatment system from Norweco is available in capacities ranging from 1,500 to 500,000 gpd. Plants employ the extended aeration treatment process to quickly and efficiently oxidize organic compounds. The system can be easily enlarged or modified, and has the flexibility for any treatment requirement, including pretreatment, AFE, ASH, tertiary, disinfection, denitrification and phosphorus removal. Non-clog Evenair diffusers reduce plant maintenance and the Air-lift surface skimmer simplifies maintenance. Heavy-duty reinforced precast concrete tanks provide durability and long life to each plant. Each system is sold complete, including delivery, tank setting, equipment installation, startup and service. 800/667-9326; www.norweco.com.