Commercial aerobic treatment units from Hydro-Action use an activated sludge treatment process that constantly infuses oxygen to wastewater where aerobic bacteria metabolize the waste. Commercial units are available as Set-N-Go designs for 1,000 and 1,500 gpd, and can be modularly designed to treat up to 6,000 gpd. These units are made of lightweight, high-strength fiberglass, resulting in easier installation. The simple treatment process means easier maintenance and reduced operating costs. 800/370-3749; www.hydro-action.com.