The Set-N-Go onsite wastewater treatment unit from Hydro-Action Industries uses an activated sludge treatment process designed to add oxygen to wastewater where aerobic bacteria metabolize the waste. Then it separates in a clarification chamber without the use of media filters or carbon additives. The three-tank combination operates as a single unit offering pretreatment, aerobic treatment and a pump tank. Systems are available as 72-inch-tall standard and 52-inch-tall low-profile models. They are NSF Standard 40 and 245 Nitrogen Reduction approved with testing results of an average CBOD5 of 4 mg/L (98.5 percent reduction), TSS 9 mg/L (95.25 percent reduction) and 5.1 mg/L dissolved oxygen. Nitrogen reduction averages less than 10 mg/L TN and 79 percent reduction in total nitrogen removal. 800/370-3749; www.hydro-action.com.