The Modulair package wastewater treatment system from Norweco is designed as a maintenance-free method of wastewater treatment with system capacities ranging from 1,500 to 500,000 gpd. Plants employ the extended aeration treatment process to quickly and efficiently oxidize organic compounds, according to the maker. 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. Nonclog Evenair diffusers reduce plant maintenance, and the air-lift surface skimmer simplifies maintenance. Heavy-duty reinforced precast concrete tanks provide durability and long life. The complete system is installed and serviced by licensed, factory-trained distributors. 800-667-9326; www.norweco.com.